Check what you are trying to achieve
A viewer may want to sign out of a shared tablet, change how they log in, stop marketing messages or erase their account. Those goals need different controls. Apple’s settings list the apps and developers using Sign in with Apple. Review the particular entry before deleting a connection, especially when the same developer supplies more than one app.
Read the reconnect behaviour before confirming
Apple documents that stopping its sign-in connection signs you out on the device. If you use Sign in with Apple again, you return to the account used previously. Some apps offer a separate password for that existing account. Consequently, repeatedly disconnecting and reconnecting is not a reliable way to obtain a fresh profile or remove old viewing history. Use the service’s own account controls for those tasks.
Email forwarding has its own scope
The same settings guidance distinguishes stopping sign-in from turning off a developer’s email forwarding. Where a developer shares an account across apps, either change can affect all its apps. Changing the general forwarding destination applies across Hide My Email developers. Before a recovery attempt, note the app’s existing identifier and ensure you can receive its legitimate messages. Keep any account-deletion request with the service that holds the profile, rather than assuming the Apple connection has erased it.
Questions, answered
Does reconnecting necessarily create a brand-new service account?
No. Apple says using Sign in with Apple again can sign you into the same account used before.