awesome - i've submitted a report here: FB13253394
thanks!
ziggmike
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ok, i've filed a report: FB14174632
thanks!
sorry, i should've followed up 😅
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.