Hey y’all, I’ll be the first to concede this post is partially just shameless self marketing of my game for iOS. That being said, I dealt with a LOT of hurdles in getting this game fully deployed to the app store, and I think I could be a big help to some others who are dealing with said hurdles.
Ask me anything you want about how I accomplished certain aspects of the project, and I will do my best to assist you. The game is free with in app purchases and admob ads, so I had to deal with implementing both those things amongst other issues. It’s been hard to find information on some of these things, but the first helpful bit of information I will kick this thread off with is this:
Check out Nineva Studios products. I am not at all affiliated, but their admob goodies package pretty much saved me as far as getting admob doing what it is supposed to (though it was still a massive set up process). I also wound up buying iOS native goodies, and it is quite helpful for the share function and a lot of other features (though I’m still figuring out the sign in part to streamline my playfab account creation).
UPDATE:
I was able to get sign in with Apple, and propagating that information to Playfab working as well. Also thanks to that tool from Nineva Studios. I’m still watching this thread, let me know anything I can help with. 
UPDATE #2:
Although Nineva Studios iOS goodies tool did the trick for apple sign in, this doesn’t actually give access to the game center display name. I didn’t want to display the user’s apple display name, so I did some work with GPT and was able to get access to that via GameKit, and now I can properly propagate a viable display name to Playfab, and update that if the user changes it.
UPDATE #3:
If anyone wants immediate help with anything, I’ll still be watching this thread for a while, but I also have a support Discord that I used for my Fab products. Feel free to pop in if I can help with anything. Farr Out Studio Support