@Patrick Koning sorry, i put my "answer" in a comment above - should've done a proper reply and marked it as answered 😅
yes, i did eventually figure it out - the group id for the mac builds needs to have your team id as a prefix (this is new for sequoia)
https://developer.apple.com/documentation/xcode/configuring-app-groups#Create-App-Groups-for-macOS-apps
my app was using the Multiplatform project template, and the new group id requirement is not valid for other OS targets... i ended up separating up my app and widget extension targets: macOS and everything else.
i can't imagine the stress/pressure folk at apple have been under as part of this release, so this is meant as a sometime future thing.. but it feels like this solution to app groups on macOS could do with a revisit.. losing the ability to have a single target for multiplatform apps with app groups isn't the end of the world, but for me it's nice to keep it all under one target if at all possible.. 😊
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App & System Services
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General
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