Revoking Admin
Actions apply to the original locked out admin user acc:
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Revoke admin + Grants moderator = login failed/same error.
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Revoke moderator
- first login (no error) but stalls on two-factor/signing-in spinning wheel
- Left it for about 10 mins (server was showing load uptick on login), still nothing
- however “active” users tab shows the user logged in Xm ago hmm

- Try second login in another (private) window which succeeds!
Next, using another admin acc Grant Admin to the signed in former admin user acc
- While logged in Admin update message arrives indicating success.
- Refresh page and Oops error appears once again
- Revoke admin again, refresh page and error is bypassed again
- Grant Moderator status
- Refreshed page, Oops error appeared.
- Revoke Moderation privs, restored access.
Bottom line user must be converted (via admin) to normal user status to have access.
A workaround for a admin user with blocked user account access due to Oops error, where there is an urgent need to read messages/chats and communicate with users but will not be able to access any specific admin categories or carry out any moderation duties.
While this does re-establish user acc access and communications, ultimately it does not solve the technical root of the problem as outlined in OP.