Apple Sign-in (Hide my email)
If you choose the option to sign in with Apple and enable 'Hide my email', it will create a separate/new account not connected to your email.
Therefore, if you purchase a subscription with an Apple account and enable 'Hide my email', it won't recognize you when you try to watch content because it's a different account. This works the same way vice versa, if you purchase a subscription with your email and then later try to access content with an Apple Sign-in.