To explain the history of the problem: Yesterday I could post, but I couldn't reply to any posts from my Android device.
I had no issues with the web interface.
I logged out and logged back in using a recovery code. I also changed my password at the same time.
Today, it's normal that I have to enter the new password on the web.
The problem occurs when the recovery code isn't recognized.
I have two-factor authentication. The code sent by phone takes 5 minutes to arrive, so we're past the deadline.
I don't know what to do anymore.