AAM 6.x Unable to change or add new mailboxes, getting error License in restricted mode.
Checking WebLM and License management it does not show a license file on server.
The License Status page provides the Aura Messaging license mode and error information.
License Mode: Restricted
Number of available seat licenses for VALUE_MSG_SEAT_MAINSTREAM (Mainstream mailbox user) exceeded or expired. No new users can be added and no changes can be made to existing users. Grace days: 34 used / 30 available.