When importing users with Primary Authentication set to LDAP or Radius you receive the error "The following Users were not added because they have an invalid Primary Authentication specified".
In 2.3.765 LDAP and Radius were added as Primary Authentication methods, but the batch import will not accept these values.
Import the users without the primary authentication information, and then perform a "Batch update" for the users, with the "Primary Authentication", "Primary UserID", and "Primary Authentication System" specified in the file. The batch update process will accept Radius / LDAP as primary.
Waiting for fix in a future release of TPAM