Note: This is just a stab at it, because I'm not 100% sure on it.
When you hook up to an LDAP directory and provision user a key is generated for each user from the LDAP directory:
LDAP Directory1: email@example.com = KEY 1234
LDAP Directory2: firstname.lastname@example.org = KEY 4567
While the username is the same between the two directories, the keys for the user is different - and so you aren't able to migrate. My guess would be if you connected the new environment to the old LDAP directory things would work fine.
Now as for solving it - I think we need to test the theory first. Are you able to connect to the underlying FDM database? If so I would go on the hunt for the user table with the keys in it.
Thanks for your reply,
We got the solution for the above issues. Our FDM solution Architect tested some of his custom script and showed the result with one or two sso. that was perfect.
i will post the solution with the steps once its success fully completed.
Thanks again for your reply