Temporary password are not designed to work with Grouped users due to security risks.
Standard users only.
The security risks being if multiple standard users are sharing a Grouped user this gives the ability for the user with the temp password to inform the other users of the temp password essentially bypassing 2FA.
This also creates the ability for the user with the temporary password to allow other users that share the same grouped user to bypass administrative intervention if they have misplaced their tokens.
All versions of AuthAnvil Two Factor Auth.