Per Zoom, this issue is occuring because we are a Zoom One Enterprise with the automatic assignment of phone users disabled. As such, our new users end up in the Zoom Phone Pending tab and are awaiting assignment. Instead of directly assigning the calling plan (not possible with Zoom One as the error message above indicates), we should instead be using the endpoint Zoom Phone Master API with the “assign_pending_user” batch_type.
This looks to be the correct method, but I am seeing the error that the access token does not contain the scope phone:master even though it does indeed contain that scope, as seen in the attached screenshot.
