diff --git a/app/assets/javascripts/app/controllers/agent_ticket_create.coffee b/app/assets/javascripts/app/controllers/agent_ticket_create.coffee
index 93bd6f11e..f14fd7b55 100644
--- a/app/assets/javascripts/app/controllers/agent_ticket_create.coffee
+++ b/app/assets/javascripts/app/controllers/agent_ticket_create.coffee
@@ -33,6 +33,7 @@ class App.TicketCreate extends App.Controller
     @bind('ui:rerender', =>
       return if !@authenticateCheck()
       @renderQueue()
+      @tokanice()
     )
 
     # listen to rerender sidebars
@@ -55,6 +56,7 @@ class App.TicketCreate extends App.Controller
   changeFormType: (e) =>
     type = $(e.currentTarget).data('type')
     @setFormTypeInUi(type)
+    @tokanice()
 
   setFormTypeInUi: (type) =>
 
@@ -347,6 +349,11 @@ class App.TicketCreate extends App.Controller
     # update taskbar with new meta data
     App.TaskManager.touch(@taskKey)
 
+    @tokanice()
+
+  tokanice: ->
+    App.Utils.tokaniceEmails('.content.active input[name=cc]')
+
   localUserInfo: (e) =>
     return if !@sidebarWidget
     params = App.ControllerForm.params($(e.target).closest('form'))
diff --git a/app/assets/javascripts/app/controllers/ticket_zoom/article_new.coffee b/app/assets/javascripts/app/controllers/ticket_zoom/article_new.coffee
index 2688e2efa..a8138a5d3 100644
--- a/app/assets/javascripts/app/controllers/ticket_zoom/article_new.coffee
+++ b/app/assets/javascripts/app/controllers/ticket_zoom/article_new.coffee
@@ -103,22 +103,7 @@ class App.TicketZoomArticleNew extends App.Controller
     )
 
   tokanice: ->
-    source = "#{App.Config.get('api_path')}/users/search"
-    a = ->
-      $('.content.active .js-to, .js-cc, js-bcc').tokenfield(
-        createTokensOnBlur: true
-        autocomplete: {
-          source: source
-          minLength: 2
-        },
-      ).on('tokenfield:createtoken', (e) ->
-        if !e.attrs.value.match(/@/) || e.attrs.value.match(/\s/)
-          e.preventDefault()
-          return false
-        e.attrs.label = e.attrs.value
-        true
-      )
-    App.Delay.set(a, 500, undefined, 'tags')
+    App.Utils.tokaniceEmails('.content.active .js-to, .js-cc, js-bcc')
 
   setPossibleArticleTypes: =>
     @articleTypes = []
diff --git a/app/assets/javascripts/app/lib/app_post/utils.coffee b/app/assets/javascripts/app/lib/app_post/utils.coffee
index 25fb9a27f..8fc83ec1f 100644
--- a/app/assets/javascripts/app/lib/app_post/utils.coffee
+++ b/app/assets/javascripts/app/lib/app_post/utils.coffee
@@ -1060,3 +1060,23 @@ class App.Utils
           articleNew.cc = addAddresses(article.cc, articleNew.cc)
 
     articleNew
+
+  # apply email token field with autocompletion
+  @tokaniceEmails: (selector) ->
+    source = "#{App.Config.get('api_path')}/users/search"
+    a = ->
+      $(selector).tokenfield(
+        createTokensOnBlur: true
+        autocomplete: {
+          source: source
+          minLength: 2
+        },
+      ).on('tokenfield:createtoken', (e) ->
+        if !e.attrs.value.match(/@/) || e.attrs.value.match(/\s/)
+          e.preventDefault()
+          return false
+        e.attrs.label = e.attrs.value
+        true
+      )
+    App.Delay.set(a, 500, undefined, 'tags')
+
diff --git a/script/build/test_slice_tests.sh b/script/build/test_slice_tests.sh
index f49030955..5dcfd5e55 100755
--- a/script/build/test_slice_tests.sh
+++ b/script/build/test_slice_tests.sh
@@ -23,6 +23,7 @@ if [ "$LEVEL" == '1' ]; then
   # test/browser/agent_organization_profile_test.rb
   rm test/browser/agent_ticket_attachment_test.rb
   rm test/browser/agent_ticket_auto_assignment_test.rb
+  rm test/browser/agent_ticket_create_cc_tokenizer_test.rb
   rm test/browser/agent_ticket_create_reset_customer_selection_test.rb
   rm test/browser/agent_ticket_create_template_test.rb
   rm test/browser/agent_ticket_email_reply_keep_body_test.rb
@@ -89,6 +90,7 @@ elif [ "$LEVEL" == '2' ]; then
   rm test/browser/agent_organization_profile_test.rb
   rm test/browser/agent_ticket_attachment_test.rb
   rm test/browser/agent_ticket_auto_assignment_test.rb
+  rm test/browser/agent_ticket_create_cc_tokenizer_test.rb
   rm test/browser/agent_ticket_create_reset_customer_selection_test.rb
   rm test/browser/agent_ticket_create_template_test.rb
   rm test/browser/agent_ticket_email_reply_keep_body_test.rb
@@ -155,6 +157,7 @@ elif [ "$LEVEL" == '3' ]; then
   rm test/browser/agent_organization_profile_test.rb
   # test/browser/agent_ticket_attachment_test.rb
   # test/browser/agent_ticket_auto_assignment_test.rb
+  #rm test/browser/agent_ticket_create_cc_tokenizer_test.rb
   # test/browser/agent_ticket_create_reset_customer_selection_test.rb
   # test/browser/agent_ticket_create_template_test.rb
   # test/browser/agent_ticket_email_reply_keep_body_test.rb
@@ -221,6 +224,7 @@ elif [ "$LEVEL" == '4' ]; then
   rm test/browser/agent_organization_profile_test.rb
   rm test/browser/agent_ticket_attachment_test.rb
   rm test/browser/agent_ticket_auto_assignment_test.rb
+  rm test/browser/agent_ticket_create_cc_tokenizer_test.rb
   rm test/browser/agent_ticket_create_reset_customer_selection_test.rb
   rm test/browser/agent_ticket_create_template_test.rb
   rm test/browser/agent_ticket_email_reply_keep_body_test.rb
@@ -286,6 +290,7 @@ elif [ "$LEVEL" == '5' ]; then
   rm test/browser/agent_organization_profile_test.rb
   rm test/browser/agent_ticket_attachment_test.rb
   rm test/browser/agent_ticket_auto_assignment_test.rb
+  rm test/browser/agent_ticket_create_cc_tokenizer_test.rb
   rm test/browser/agent_ticket_create_reset_customer_selection_test.rb
   rm test/browser/agent_ticket_create_template_test.rb
   rm test/browser/agent_ticket_email_reply_keep_body_test.rb
@@ -354,6 +359,7 @@ elif [ "$LEVEL" == '6' ]; then
   rm test/browser/agent_organization_profile_test.rb
   rm test/browser/agent_ticket_attachment_test.rb
   rm test/browser/agent_ticket_auto_assignment_test.rb
+  rm test/browser/agent_ticket_create_cc_tokenizer_test.rb
   rm test/browser/agent_ticket_create_reset_customer_selection_test.rb
   rm test/browser/agent_ticket_create_template_test.rb
   rm test/browser/agent_ticket_email_reply_keep_body_test.rb
diff --git a/test/browser/agent_ticket_create_cc_tokenizer_test.rb b/test/browser/agent_ticket_create_cc_tokenizer_test.rb
new file mode 100644
index 000000000..9d2800c2f
--- /dev/null
+++ b/test/browser/agent_ticket_create_cc_tokenizer_test.rb
@@ -0,0 +1,34 @@
+require 'browser_test_helper'
+
+# Regression test for UI bugfix
+# https://github.com/zammad/zammad/issues/1990
+#
+# Ensure that CC field when creating a new ticket is autocompleting user emails
+
+class AgentTicketCreateResetCustomerSelectionTest < TestCase
+  def test_tokenizer
+    @browser = browser_instance
+
+    login(
+      username: 'agent1@example.com',
+      password: 'test',
+      url: browser_url,
+    )
+    tasks_close_all()
+
+    click(
+      css: 'a[href="#ticket/create"]'
+    )
+
+    @browser.find_element(:css, 'li[data-type=email-out]').click
+
+    elem = @browser.find_element(:name, 'cc')
+    elem.send_keys 'test@example.com'
+    elem.send_keys :enter
+
+    exists(
+      css: '.token-label',
+      value: 'test@example.com'
+    )
+  end
+end