We just figured this one out today. Go to your identifer tab in the developer.apple.com website. If your account is approved for enterprise then you have a 3rd tab here. Capabilities, App service, and then a new 3rd tab (forgetting name). In that tab there is "main camera" access when you need to check for your application. You'll need to create a new provisioning profile after this.

Same. Thought I was going crazy. One build worked yesterday and then with minimal changes it just stopped working. Tried so many things in the past 24hours ish. Glad to see I am not completely insane. Unity version 2019.4. Xcode 13.4. Also switched over to cloud build on Unity in hopes that would fix it but it did not.