Not able to sign into my Apple Watch I gave him because it’s still linked to old account

Hey I recently gave my Apple Watch series 1 away . My friend says there not able to sin in to it because it’s still linked to my account . I removed my account from the watch an can no longer sign in to the watch but my friend says she was told that she had to sign into it with my account but she lives in Texas an I’m in north Carolina. Is there anyway you can take the watch off my account?

[Re-Titled by Moderator]