Error setting permissions for a resource mailbox
we have the following problem when setting the permission for a resource mailbox. When adding a specific user, we get an error message that multiple users/groups match the identity and that we should specify a valid value. After checking in our AD we could not find any name collision, the username is unique. Do you guys have any idea what this could be due to?
Thanks in advance for your efforts!
Krämer IT Solutions GmbH