How to unlink your Facebook account:
You can unlink your game from your Facebook account by tapping on the gear icon in game. This brings up the "Settings Menu". From the "Settings Menu" you can tap on "Account Info". This will give you the ability to unlink your game from your Facebook account.
 
How to unlink your Google account:
  1. Open the game
  2. Tap your profile image in the top left corner
  3. Tap “Account Info”
  4. Tap “Unlink” for the Google account option (the account with the green controller icon). Please note that unless you disable the app’s auto sign in with Google, you will be re-linked the next time you open the app while using this Google account. See the next question below for instructions on how to prevent this.

How can I stop my Google account from linking each time I open the game?

  1. Fully exit out of Hogwarts Mystery
  2. Open the "Play Games" app (not Google Play/Play Store)
  3. Tap the 3 dots in the top right
  4. Tap “Settings”
  5. Scroll down to the "You data" section and tap "Change account for games"
  6. Scroll down to Harry Potter: Hogwarts Mystery and tap "Change"
  7. Tap "Sign out"
  8. Return to Hogwarts Mystery and your account will no longer be linked to Google. Note that you'll still get a "Google Play Games Login Failed" message on start up, simply tap the X button to close out of the message. At this time there is no way to prevent this popup from showing if you choose to unlink your account.

Further troubleshooting for Google accounts can be found in our Google Account Linking FAQ.