diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index c8943667..70df16a3 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -141,7 +141,11 @@ class ApplicationController < ActionController::Base
         retrieve_provider_info(@user_domain, 'api2', 'getUserGreenlightCredentials')
       rescue => e
         if e.message.eql? "No user with that id exists"
-          render "errors/not_found", locals: { user_not_found: true }
+          render "errors/not_found", locals: { message: I18n.t("errors.not_found.user_not_found.message"),
+            help: I18n.t("errors.not_found.user_not_found.help") }
+        elsif e.message.eql? "Provider not included."
+          render "errors/not_found", locals: { message: I18n.t("errors.not_found.user_missing.message"),
+            help: I18n.t("errors.not_found.user_missing.help") }
         else
           render "errors/internal_error"
         end
diff --git a/app/controllers/errors_controller.rb b/app/controllers/errors_controller.rb
index 5c388a4e..e9131af4 100644
--- a/app/controllers/errors_controller.rb
+++ b/app/controllers/errors_controller.rb
@@ -21,10 +21,6 @@ class ErrorsController < ApplicationController
     render status: 404, formats: :html
   end
 
-  def unprocessable
-    render status: 422, formats: :html
-  end
-
   def internal_error
     render status: 500, formats: :html
   end
diff --git a/app/views/errors/bigbluebutton_error.html.erb b/app/views/errors/bigbluebutton_error.html.erb
index b1e41b6b..f30cdd8e 100644
--- a/app/views/errors/bigbluebutton_error.html.erb
+++ b/app/views/errors/bigbluebutton_error.html.erb
@@ -14,7 +14,7 @@
 %>
 
 <div class="container text-center pt-9">
-  <div class="display-1 text-muted mb-5"><%= I18n.t("errors.bigbluebutton.title") %></div>
-  <h1 class="h2 mb-3"><%= I18n.t("errors.bigbluebutton.message") %></h1>
-  <p class="h4 text-muted font-weight-normal mb-7"><%= I18n.t("errors.bigbluebutton.help", doc_link: "http://docs.bigbluebutton.org/greenlight/gl-install.html#setting-bigbluebutton-credentials").html_safe %></p>
+  <div class="display-1 text-muted mb-5"><%= t("errors.bigbluebutton.title") %></div>
+  <h1 class="h2 mb-3"><%= t("errors.bigbluebutton.message") %></h1>
+  <p class="h4 text-muted font-weight-normal mb-7"><%= t("errors.bigbluebutton.help", doc_link: "http://docs.bigbluebutton.org/greenlight/gl-install.html#setting-bigbluebutton-credentials").html_safe %></p>
 </div>
diff --git a/app/views/errors/internal_error.html.erb b/app/views/errors/internal_error.html.erb
index af926b5b..0c76f1db 100644
--- a/app/views/errors/internal_error.html.erb
+++ b/app/views/errors/internal_error.html.erb
@@ -14,7 +14,7 @@
 %>
 
 <div class="container text-center pt-9">
-  <div class="display-1 text-muted mb-5">500</div>
+  <div class="display-1 text-primary mb-5">500</div>
   <h1 class="h2 mb-3"><%= t("errors.internal.message") %></h1>
   <p class="h4 text-muted font-weight-normal mb-7"><%= t("errors.internal.help") %></p>
   <a class="btn btn-primary" href="javascript:history.back()">
diff --git a/app/views/errors/not_found.html.erb b/app/views/errors/not_found.html.erb
index 95bdcbbb..d259ceac 100644
--- a/app/views/errors/not_found.html.erb
+++ b/app/views/errors/not_found.html.erb
@@ -14,10 +14,10 @@
 %>
 
 <div class="container text-center pt-9">
-  <div class="display-1 text-muted mb-5">404</div>
-  <% if defined?(user_not_found) %>
-    <h1 class="h2 mb-3"><%= t("errors.not_found.user_message") %></h1>
-    <p class="h4 text-muted font-weight-normal mb-7"><%= t("errors.not_found.user_help") %></p>
+  <div class="display-1 mb-5 text-primary">404</div>
+  <% if defined?(message) && defined?(help) %>
+    <h1 class="h2 mb-3"><%= message %></h1>
+    <p class="h4 text-muted font-weight-normal mb-7"><%= help %></p>
   <% else %>
     <h1 class="h2 mb-3"><%= t("errors.not_found.message") %></h1>
     <p class="h4 text-muted font-weight-normal mb-7"><%= t("errors.not_found.help") %></p>
diff --git a/app/views/errors/unauthorized.html.erb b/app/views/errors/unauthorized.html.erb
index 1e6682a8..23dcdd7d 100644
--- a/app/views/errors/unauthorized.html.erb
+++ b/app/views/errors/unauthorized.html.erb
@@ -14,7 +14,7 @@
 %>
 
 <div class="container text-center pt-9">
-  <div class="display-1 text-muted mb-5">401</div>
-  <h1 class="h2 mb-3"><%= I18n.t("errors.unauthorized.message") %></h1>
-  <p class="h4 text-muted font-weight-normal mb-7"><%= I18n.t("errors.unauthorized.help") %></p>
+  <div class="display-1 text-primary mb-5">401</div>
+  <h1 class="h2 mb-3"><%= t("errors.unauthorized.message") %></h1>
+  <p class="h4 text-muted font-weight-normal mb-7"><%= t("errors.unauthorized.help") %></p>
 </div>
diff --git a/app/views/errors/unprocessable.html.erb b/app/views/errors/unprocessable.html.erb
deleted file mode 100644
index cec62f44..00000000
--- a/app/views/errors/unprocessable.html.erb
+++ /dev/null
@@ -1,23 +0,0 @@
-<%
-# BigBlueButton open source conferencing system - http://www.bigbluebutton.org/.
-# Copyright (c) 2018 BigBlueButton Inc. and by respective authors (see below).
-# This program is free software; you can redistribute it and/or modify it under the
-# terms of the GNU Lesser General Public License as published by the Free Software
-# Foundation; either version 3.0 of the License, or (at your option) any later
-# version.
-#
-# BigBlueButton is distributed in the hope that it will be useful, but WITHOUT ANY
-# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
-# PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
-# You should have received a copy of the GNU Lesser General Public License along
-# with BigBlueButton; if not, see <http://www.gnu.org/licenses/>.
-%>
-
-<div class="container text-center pt-9">
-  <div class="display-1 text-muted mb-5">422</div>
-  <h1 class="h2 mb-3"><%= t("errors.unprocessable.message") %></h1>
-  <p class="h4 text-muted font-weight-normal mb-7"><%= t("errors.unprocessable.help") %></p>
-  <a class="btn btn-primary" href="javascript:history.back()">
-    <i class="fas fa-arrow-left mr-2"></i><%= t("go_back") %>
-  </a>
-</div>
diff --git a/config/locales/en.yml b/config/locales/en.yml
index fe338331..9082984e 100755
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -119,7 +119,7 @@ en:
       message: Invalid BigBlueButton Endpoint and Secret
       title: Server Error
     internal:
-      message: Oh no! Looks like something went wrong on our end.
+      message: Looks like something went wrong on our end.
       help: The error has been logged, we'll take a look!
     migration_error:
       contact_admin: If you are not an administrator, please contact one.
@@ -138,17 +138,18 @@ en:
       confirmation: doesn't match %{attribute}
       inclusion: is not included in the list
     not_found:
-      message: Whoops! Looks like we can't find that.
+      message: Sorry! The page you are looking for does not exist.
       help: Is it possible its been removed?
-      user_message: User Not Found.
-      user_help: Sorry, this user is not registered.
+      user_not_found:
+        help: Please contact an administrator.
+        message: Sorry, this user is not registered.
+      user_missing:
+        help: Please verify the URL and try again
+        message: The URL that you have entered is not valid.
     title: Errors
     unauthorized:
       message: You do not have access to this application
       help: If you believe this is a mistake, please contact your system administrator.
-    unprocessable:
-      message: Oops! Request is unprocessable.
-      help: Unfortunately this isn't a valid request.
   expired_reset_token: Password reset link has expired!
   features:
     title: Features
diff --git a/config/routes.rb b/config/routes.rb
index e0429db7..a1dc1eaa 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -22,7 +22,6 @@ Rails.application.routes.draw do
   # Error routes.
   match '/401', to: 'errors#unauthorized', via: :all, as: :unauthorized
   match '/404', to: 'errors#not_found', via: :all, as: :not_found
-  match '/422', to: 'errors#unprocessable', via: :all
   match '/500', to: 'errors#internal_error', via: :all, as: :internal_error
 
   # Signin/Signup routes.
diff --git a/spec/controllers/application_controller_spec.rb b/spec/controllers/application_controller_spec.rb
index 14bf1f65..f8f8a917 100644
--- a/spec/controllers/application_controller_spec.rb
+++ b/spec/controllers/application_controller_spec.rb
@@ -74,7 +74,7 @@ describe ApplicationController do
     it "renders a 404 error if user is not found" do
       allow(Rails.configuration).to receive(:loadbalanced_configuration).and_return(true)
       allow(Rails.env).to receive(:test?).and_return(false)
-      allow_any_instance_of(SessionsHelper).to receive(:parse_user_domain).and_return("")
+      allow_any_instance_of(SessionsHelper).to receive(:parse_user_domain).and_return("fake_provider")
       allow_any_instance_of(BbbApi).to receive(:retrieve_provider_info).and_raise("No user with that id exists")
 
       routes.draw { get "user_not_found" => "anonymous#user_not_found" }
@@ -83,7 +83,19 @@ describe ApplicationController do
       expect(response).to render_template("errors/not_found")
     end
 
-    it "renders a 500 error if any other error is not found" do
+    it "renders a 404 error if user is not given" do
+      allow(Rails.configuration).to receive(:loadbalanced_configuration).and_return(true)
+      allow(Rails.env).to receive(:test?).and_return(false)
+      allow_any_instance_of(SessionsHelper).to receive(:parse_user_domain).and_return("")
+      allow_any_instance_of(BbbApi).to receive(:retrieve_provider_info).and_raise("Provider not included.")
+
+      routes.draw { get "user_not_found" => "anonymous#user_not_found" }
+
+      get :user_not_found
+      expect(response).to render_template("errors/not_found")
+    end
+
+    it "renders a 500 error if any other error related to bbb api" do
       allow(Rails.configuration).to receive(:loadbalanced_configuration).and_return(true)
       allow(Rails.env).to receive(:test?).and_return(false)
       allow_any_instance_of(SessionsHelper).to receive(:parse_user_domain).and_return("")
diff --git a/spec/controllers/errors_controller_spec.rb b/spec/controllers/errors_controller_spec.rb
index 48616b0a..d346e940 100644
--- a/spec/controllers/errors_controller_spec.rb
+++ b/spec/controllers/errors_controller_spec.rb
@@ -26,13 +26,6 @@ describe ErrorsController, type: :controller do
     end
   end
 
-  describe "GET #unprocessable" do
-    it "returns unprocessable" do
-      get :unprocessable
-      expect(response).to have_http_status(422)
-    end
-  end
-
   describe "GET #internal_error" do
     it "returns internal_error" do
       get :internal_error