It has become possible to use the user email as username when using SSO. On the Joomla side, third-party plugins are usually used for this. On the Moodle side, the parameter must be used Allow log in via email authloginviaemail

When logging out of Joomla, the user logs out of Moodle at the same time. To do this, install the version of the authentication plugin jmoodle 1.1.0 (20240409)

The code has become simpler and more reliable.