Thanks! Glad to know it's not just me.

Hi Eskimo, This is entirely new to TestFlight builds. I've done numerous updates for the past 10 years without issue via the Mac App Store. Also, as mentioned, doing a Developer ID build from the same archive will properly update the Mac App Store version. That is, won't prompt for keychain access. Any ideas? I do have a support request in as well, FYI. Thanks! //Ray

Hi Quinn, It is a standard Mac app and is only distributed via the Mac App Store. Thanks! //Ray