Dear Jenm_78
Good day! Thank you for posting in Microsoft Community.
Based on your description, it seems that when you use the Restrict Editing function in Word and type the user name you got the error message.
- For the Restrict Access function in Word, if you want to use Restrict access function to documents, you should Restrict access to documents with Information Rights Management in Word, which installation to be used. For your reference: Restrict access to documents with Information Rights Management in Word (microsoft.com)
- if you want to restrict editing for some users in the documents, it would probably be easier to make use of a password for editing the document, too.
In Review tab>Restrict editing>Select the Yes, Start Enforcing Protection button.
Enter and then reenter a password in the Start Enforcing Protection dialog box.
Select the OK button to close the Start Enforcing Protection dialog box.
3.For the error message you got when use restrict editing function, to help us narrow down the behavior , we would like to collect more detailed information about the situation you are experiencing. Please kindly share with us the information below:
- First please make sure these users in domain/admin group, you could not get the add users function to work unless they were a member of the domain/admin group. I also suggest you check users' permission in your environment.
- Could you tell me where did you store this file in your environment?
- Does other users in your organization have the same behavor in Word when use restrict editing function?
- Can you tell us your Word product information? Go to Word>File>Account then share a screenshot to us.
- Please kindly share a screenshot of the error message you got to us.
We’re looking forward to your reply and will continue to help you all the time! If there are any misunderstanding or unclear, you can post back in your free time.
Your understanding and patience will be highly appreciated. I hope that you are keeping safe and well!
Sincerely,
Stacey | Microsoft Community Moderator