I’m using NextCloud 20.
I installed and enabled the app “Two Factor e-mail provider”
I found the option to force two factor auth only for a group.
Then i use a user in this group i’ve the message that two factor is enabled for my account but not configured.
We are not interested about ToTP beacause of smartphone problem with our users … (noobs).
I did not found any tuto about two factor email only with NextCloud …