Providing more information on why certain users can't be added to multi-profile

chrome/app/chromeos_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- ChromeOS-specific strings (included from generated_resources.grd).
      Everything in this file is wrapped in <if expr="chromeos">. -->
 <grit-part>
   <message name="IDS_EMPTY_STRING" desc="Empty string, exist only to make code generic. No translation required.">
   </message>
   <message name="IDS_CHROMEBOOK" desc="The localized name for Chromebook.">
     Chromebook
   </message>
   <message name="IDS_CHROMEBOX" desc="The localized name for Chromebox">
@@ skipping 1631 matching lines @@
   </message>
   <message name="IDS_SUPERVISED_USER_IMPORT_USERNAME_EXIST" desc="In list of supervised users eligible for import, this text indicates that another supervised user with same name already exists on device.">
     <ph name="USER_DISPLAY_NAME">$1<ex>John</ex></ph> (name used on this device)
   </message>
   <message name="IDS_SUPERVISED_USER_IMPORT_BUBBLE_TEXT" desc="Text shown in notification bubble when user enters name of user that can be imported.">
     Looks like you're already managing a user by that name. Did you want to <ph name="LINK_START">$1<ex>&gt;a&lt;</ex></ph>import <ph name="USER_DISPLAY_NAME">$2<ex>John</ex></ph> to this device<ph name="LINK_END">$3<ex>&gt;/a&lt;</ex></ph>?
   </message>
   <message name="IDS_MULTI_PROFILES_RESTRICTED_POLICY_TITLE" desc="Text that is shown on the title of the bubble shown for user pod which is not allowed in multi-profiles session.">
     Can't set up multiple sign-in
   </message>
-  <message name="IDS_MULTI_PROFILES_NOT_ALLOWED_POLICY_MSG" desc="Text that is shown on the bubble shown for user pod which is not allowed in multi-profiles session because of not-allowed policy.">
+  <message name="IDS_MULTI_PROFILES_NOT_ALLOWED_POLICY_MSG" desc="Text that is shown on the bubble shown for user pod which is not allowed in multi-profiles session because of not-allowed policy or because of usage policy-pushed certificates.">
     The administrator for this account has disallowed multiple sign-in.
   </message>
   <message name="IDS_MULTI_PROFILES_PRIMARY_ONLY_POLICY_MSG" desc="Text that is shown on the bubble shown for user pod which is not allowed in multi-profiles session because of primary-only policy.">
     The administrator for this account requires this account to be the first signed-in account in a multiple sign-in session.
   </message>
   <message name="IDS_MULTI_PROFILES_OWNER_PRIMARY_ONLY_MSG" desc="Text that is shown on the bubble shown for owner user pod which is not allowed in multi-profiles session because it has to be primary user in the session.">
     This owner account has to be the first signed-in account in a multiple sign-in session.
   </message>
   <message name="IDS_LOCAL_STATE_ERROR_TEXT_0" desc="Text for notification that Local State file is corrupted and powerwash is required.">
     Unfortunately, <ph name="SHORT_PRODUCT_NAME">$1<ex>Chrome</ex></ph> is unable to recover your settings. To fix the error, <ph name="SHORT_PRODUCT_NAME">$1<ex>Chrome</ex></ph> must reset your device with Powerwash.
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   <message name="IDS_SET_TIME_BUTTON_CLOSE" desc="Text for the button to close the window.">
     Done
   </message>
   <message name="IDS_SET_TIME_DATE_LABEL" desc="Label for the date input element.">
     System date
   </message>
   <message name="IDS_SET_TIME_TIME_LABEL" desc="Label for the time input element.">
     System time
   </message>
 </grit-part>