OpenVPN 25.1 -> LDAP bind error [; Can't contact LDAP server] after upgrade.

[gdur]

Just upgraded to 25.1 and ran into this problem. LDAP bind error [; Can't contact LDAP server].
I have tested the LDAP connection prior to the update and it was still operational.
This happened on 2 machines, one after the other. Where #2 is for backup purposes.
Using the OPNSense tester results in:
The following input errors were detected:
    Authentication failed.
    error: User DN not found

I checked the connectivity from the console:
nc xx.xx.x.x 389 -v -w 10 and the response is:Connection to xx.xx.x.x 389 port [tcp/ldap] succeeded!
So what is wrong with the upgrade?
Added on Sunday 2-2-2025:
Forgot to mention that this is related to OpenVPN.
I've created for some users a local password, added local database to instance settings of OpenVPN and these users are now able to login.