That doesn't appear to be specific to the app. I also have the same thing happen on the website itself, on a desktop. It's not clear that logging in to the DMV is possible at all if your password is expired.
Why so many government services in the US have such an obsession with scheduled periodic password resets, which the government's own standards body recommends against, is baffling.
Yeah, I just tried and confirmed that I still can't update my password on my desktop since I last tried on my phone this morning. It's just made that much harder to try on a phone.
I have no idea. OK, I lied. I have some idea. At a previous job I had a meeting with an enterprise customer who was auditing our security controls. Part of the conversation went a lot like this:
Them: How often do you require your employees to change their passwords?
Me: We don't.
Them: Hehe, you'll have to start doing that!
Me: We comply with NIST 800-63B section 5.1.1.2 that says not to do that unless you suspect a password's been compromised.
Them: Uh, what? Can you send me a link?
Me: You bet!
My boss, to me in Slack: OMFG did that really just happen?
Yes, I did have (and do have) that exact citation memorized because it came up often enough that it was handy to bust that out. "Do you rotate..." "NIST!" "...once every 90..." "SP 800-63B!" "...days?" "5 dot 1 dot 1 dot 2!"
Why so many government services in the US have such an obsession with scheduled periodic password resets, which the government's own standards body recommends against, is baffling.