After some research and testing, I failed to find a working up to date solution for Drupal multisite with SSO to Moodle.
We have several subdomains with Drupal and one domain with Moodle. We need to have users from Drupal sites to login to Moodle without login in a second time. Also, there is a need for Moodle to use Drupal users.
Would someone publish information on how to deal with this problem, please? Thanks.
P.S. We have are not going to use LDAP solution. The organization is too small to maintain LDAP server. We just need SSO implemented.