I had to do a password reset, and every time I was asked to enter in my new password it would just go to a blank blue screen after I submit - no messages, nothing.
I did this several times entering different new complex passwords and kept getting the same result.
Then I thought that maybe my passwords are too complex. I've been generating them using lastpass and typically look something like this: 1vNUCoMp*47QaKB&ur (FYI that is not my password!).
Anyway, I decided to try a weak password - no special characters or numbers, just a single word - and this time it worked and I saw the 'Congrats' message. Wow.
So anyway, Swann, that's pretty piss poor on multiple levels I have to say. If there are restrictions on the type of password allowed (length, character types etc), then say so on the password reset form instead of wasting my time with multiple failed attempts. And if this is the case, consider removing the restriction anyway and let people use complex passwords of their own choosing.
This is a very lousy start for someone who has just joined your ecosystem, and it makes me wonder what lax practices you might be employing elsewhere.
Anyhoo, I offer this information for others who might have struggles with the same issue, and also to motivate you to sort out this glaring problem.