Trying to log in on AB with MB gives me:

Error: invalid_request

Mismatched redirect URI

I'm not sure if it's a security risk for my account, but here's the URL:

https://musicbrainz.org/oauth2/authorize?scope=profile&state=HXpUnTGETkcGFl2KCkDr&redirect_uri=http%3A%2F%2Facousticbrainz.org%2Flogin%2Fmusicbrainz%2Fpost&response_type=code&client_id=jsnvNZnWlqIMansSkJQGWg

Firefox 67.0.2 on Linux, cache cleared.