The problem is that app groups for ios has to be in the format "group.com.domain.appName" while app groups for mac has to be in the format "TeamID.com.domain.appName". The problem you and I are running into is that multi-platform approach forces you to use the ios format. You are seeing this warning because you are using the "group.com.domain.appName". When I split my app up into multi targets and used the proper mac app group format, the "access data from other apps" warning went away.

However, for me this approach is causing issues with widget extensions which I have yet to figure out.

Thanks for replying. I built the app as a multiSystem app so the widgets should work on the MacOS without have to create a Mac specific extension. After some research I found that the problem isn't the exclusivity but there is a bug with widgets that use AppIntentConfiguration on macOS, which other people are having issues with as found here: https://developer.apple.com/forums/thread/765020?login=true&page=1#824567022

I'm still having the issue unfortunately.

So did archive with the provisioning profile, or just switch profiles, return to automatic and then archive?

I ended up changing my prompt and it worked, but thanks for the handleGeneratedError func.