Hi there,
Thank you for reaching out to us!
We are trying to reply to older posts and provide more information, in case others encounter the same issue. This issue seems to have been reported by multiple users in the same relative time-frame ( as seen here as well : Error! tenant creation through manage is no longer supported ) and our Engineering team was notified of the issue that was affecting multiple users.
A fix has been deployed by the team that resolved the issue and it seems to have not come back since.
We appreciate you reaching out and letting us know of any issues that you observe!
Hope this helped,
Gerald