Hi Antoine,
It is not possible to restore a backup taken from MYSQL to PGSQL DB. Request you to follow the steps given in Page 1 of the document attached and check for the issue again.
ADManager Plus Team
Toll Free:+1888-720-9500
Email: support@admanagerplus.com
ADManager Plus - Active Directory Management & Reporting Software
ADManager Plus Team
Toll Free:+1888-720-9500
Email: support@admanagerplus.com
ADManager Plus - Active Directory Management & Reporting Software