Unlock a Master Document From the Master Document
To unlock a master document from the master document itself, you don't need to know from which project copy it was locked. However, you can find out easily with the Show Project Copies command described in Show Master And Project Copies.
Note:
To perform this task, you must be a member of a group that is assigned to the Contractor, Contributor, Document Controller, Project Owner, or Tenant Administrator role that is assigned to the parent folder.