I keep running into this error ‘is only available in macOS 12.0 or newer`, for example with ‘async(priority:operation:)’ I am using a clean install of the 12.0 beta and a new Xcode project. What am I overlooking?
You likely need to set your deployment target to macOS 12. It's possible the new Xcode project template hasn't been updated to set 12 as the deployment target.
That was it. I thought I already checked that one.