Use case:

- Log into UI as admin
- Create user and assign him password and a TOTP token 
- Logout
- Login as user with password, change password
- Logout
- Log as an admin, make OTP required for the user
- Logout
- As a user select to sync the token - token sync fails

In the same scenario user can login successfully without token synchronization.

I also tried to login with HOTP token. Sync did not work the first time. It might have been the typo. I tried again and it worked. I created another user with another token and it worked again. So seems that it was a typo on my side.
However I think I found another issue. I will open another ticket.