Has it been working with FreeRADIUS? Or with a command-line tool?

It has been working with Freeradius.

That's likely an AD extension to the LDAP standard. It might not work with other LDAP servers. Ahh yess that makes sense thank you very much.

The issue here is that FreeRADIUS is intended to work with *multiple* different LDAP servers. Adding specific magic just for AD isn't always simple. I believe that is what is going on here. I will just revert back to the stage where it was working!

Thank you so much Alan as always you have been a great help