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Environment details? (see Admin panel -> Dashboard -> Information)
the Authentication::LDAP and AD plugin does not create users for you. It allows users to authenticate with LDAP/AD. You either need to create the users (manually or via import) or get a plugin to sync them. There is a paid plugin that does that (which I personally have used for years) called adSync.
I maintain a list of osTicket Resources on my personal web site and here on the forums that you might find useful. It includes a list of Community Plugins. Here are the two links:
https://forum.osticket.com/d/92286-resources-for-osticket
https://tmib.net/resources-for-osticket/
As a disclaimer: While many people do use 3rd Party Plugins (Also called Community Plugins) it is important to know that they have not been evaluated by, are not supported by, are not recommended by, and are not written by the Developers of osTicket. You will need to reach out to the author of the Community Plugin that you are using for support.
