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Turns out it's only required if you already exclusively use FB/Google sign in (I thought it would also apply to your-app-auth+FB+G but I guess not) https://developer.apple.com/app-store/review/guidelines/#sig...

That's not true. Any social sign-up except given exceptions will require SIWA.

Where "given exceptions" are mostly limited to obvious situations, like using Twitter signin for a Twitter client.

Huh, that was not my understanding, and your link goes on to state:

> not required if...Your app exclusively uses your company’s own account setup and sign-in systems.

So there’s no official guidance on the both/and case?

I interpret that as:

- If you only have social logins, you must implement apple sign in.

- If you only have your own login, you don't need to implement apple sign in.

- If you have both apple sign and your own login, you must implement apple sign in.

I think you meant

> If you have both social logins and your own login, you must implement apple sign in.

which is my understanding as well! Would be nice if they explicitly handle this case as it's probably the majority.

> - If you have both apple sign and your own login, you must implement apple sign in.

I would think that too, but the text is odd by saying "exclusively"

> Apps that exclusively use a third-party or social login service