I've found a bug related to manually provisioning SIP accounts that have a
dot in username, e.g. sip:email@example.com.
For those accounts Jitsi configuration file creates records like:
This extra dot in config file breaks automatic provisioning. Once a user
enters provisioning URI and restarts Jitsi, welcome screen (the one with
multiple sign in options) is presented again. Normally, user would be
automatically signed in. When user manually enters username and password on
that screen, he is signed in.