Under Picard:Preferences:General, MusicBrainz Account, "Log In" button will not work at all with Server Address port set to 443. Will work properly with port set to 80. Setting port to 80, hitting Log In button and entering generated code normally, then changing port to 443 works but isn't ideal.
Console output with picard -d when Log In is clicked with port set to 443:
Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/picard/ui/options/general.py", line 85, in login
authorization_url = self.tagger.xmlws.oauth_manager.get_authorization_url(scopes)
File "/usr/local/lib/python2.7/site-packages/picard/oauth.py", line 79, in get_authorization_url
TypeError: QUrl.setHost(QString): argument 1 has unexpected type 'int'