Not really lost, I think the new system has trouble with the length and/or certain symbols in it. Not the first time I have this problem, some sites let me register a pass but when inputting it in the loginform it gives a wrong pass error and I need to reset the pass and generate a new pass without certain symbols. So I think something gets stripped in my pass when login in which makes it a password mismatch.

...I lost my security question answer though, lesson learned for the future to enter those more carefull.