If have the same question and I hope it is possible that apps with different bundle ids can join the same GroupActifity if the variable activityIdentifier is given the same value. Can someone confirm this?

Same for us too !

Hello Incogn1to, could you please share which which library you are using to generate the key pair (ES256) that make up the passkey ?

Thank you!

Thank you for your reply, we will now implement this method :)