I'm using Expo to build my app so can't remove keys as suggested. Is there any other solution? It seems crazy to make such a breaking change without warning.

Check your App ID Configuration under 'Certificates, Identifiers & Profiles' in your Developer account. If you have anything checked that you're not actually using then you need to uncheck it or configure it correctly. In my case I had iCloud checked but didn't have a container attached. Using Expo I had to clear out my provisioning profile and rebuild as well. Hope that helps!

Adding to the pile, same problem here!