Unable to enable App Groups for an App ID

Hi,


We've got an App ID that's been around for a substancial amount of years now. Being in the process of developing new features I've tried enable App Groups service in developer portal for this AppID, but the checkmark is disable (i.e. not clickable) for this particular App ID. I can enable the service for other App IDs that were creared recently. I'm stuck wondering how I might start investigating the root cause for why App Groups are not available.


Does anyone has an insight about what the root cause might be or what kind of diagnostics exist for me to investigate the issue?


Thanks,

Dmitry