Unable to log in with normal UI and 2FA enabled

Stupid as i am i again tried to enable 2FA which worked this time. Setting Keepass / andOTP up to use SHA-256 gives me a valid code. But if i try to login on lemmy i get the message "login successful" in the bottom left corner and i am redirected back but i am not logged in. However i was able to login using the Alexandrite UI together with 2FA and i am still logged in with the "old" UI. At this point thanks again for adding the other UIs :)

Any Ideas on how to get the standard UI working again (can't remove 2FA from the other UIs)?