How to allow groups to edit parts of a closed document?

Question

Microsoft Office

The server is configured with AD RMS and AD DS.
It is necessary on the client to prohibit editing a Word 2010 document through a domain account to everyone except users of this group using IRM. I do "File-Details-Protect-Restrict Editing". I select "Read only". You can add a record or email address of individual users to exceptions. You cannot add a user group by name, and when you add a group email, changes in the document are applied normally, but when it is opened by a user of this group, editing rights are still not granted.
Thanks in advance for your reply.