MDE cannot pull passwords from Active Directory. The password is collected using a credential provider loaded at the Ctl + Alt + Del screen.
More information can be found in KB79339.
I would also recommend using the "Periodically check domain credentials for changes" option in the SSO section of the Log On tab of the MDE Product Settings policy. This will check the LastPassSet AD attribute against the preboot user and prompt the user to lock and unlock their system allowing MDE to capture the password and update the preboot user.
Thanks for advice...
I have tried with changing encryption password and it resolved now..