Username & password not accepted

I am new with Jitsi.
I installed following the guide and the first attempt worked.
I then protected the server by configuring videobridge, prosody, jicofo, and jitsi-meet.
Finally I created the accounts with
prosodyctl register account-name my-jitsi-domain.com

Now if I create a room, even after I have given my credentials it keeps asking me if I am the host.
Instead, users receive the reply that the credentials are wrong.

I don’t understand where the mistake is.

Try this comment and thread.