When calling https://api.playfab.com/documentation/client/method/GetPlayFabIDsFromFacebookIDs with a facebook ID that is known to be associated with a playfab account I get a success response and a list with one result where the facebook Id is the one requested but the playfab ID is null. I can search for the facebook account in the player list and see that it is linked correctly. Why am I unable to locate the account using this api?
When you are calling GetPlayFabIDsFromFacebookIDs, the Facebook IDs that are required in the request is not the Facebook Username, you may need to retrieve the User ID after you login. Please see the Facebook Login section on Facebook official tutorial here. PlayFab will not record the User ID in the Game Manager (or any other places) hence you have to user Facebook API to access those User ID.
Besides, if you are using testing users in Facebook app developer page like me:
You may notice the User ID will be changed after you get an access token for the first time. Make sure you are using the latest User ID
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