I’m not able to get the “Set default site group” action to work. They show up in in the share site modal but when checking access request is says: “Members cannot share this site because this site is missing a default members group”.
The issue was resolved via PM, here is the summary:
The workflow needs a pause because both of actions (creating group and settings default group) are async and you need to wait until creating is done. To achieve that we need to add a pause before Setting default group action like that: