Getting error "Apple ID already in use" while trying to sign in to face time. Unable to verify

I am trying to setup my iPad for FaceTime.

I go to Settings-FaceTime.

Put my Apple ID and password.

Asks to put the password again.

Then asks if I want to use my email I'd for FaceTime. Click Yes.

Tries to verify the applied and gives the error mentioned above.

Any help will be appreciated.