I generated my password with keepassxc, using all character classes but non-printables, and a length of 128 characters. The login form always kicks back a 400 Bad Request: incorrect_login when I try to log in, even though I'm pasting in the information from my password manager. Moreover, the same credentials on the default frontend work just fine.
Is this still happening for you? There was a bug that was fixed in version 0.0.46 that caused 400 errors when logging in with your email address instead of your username.
I generated my password with keepassxc, using all character classes but non-printables, and a length of 128 characters. The login form always kicks back a
400 Bad Request: incorrect_login
when I try to log in, even though I'm pasting in the information from my password manager. Moreover, the same credentials on the default frontend work just fine.