Hi, I've looked trough multiple discussions regarding this. A lot of discussions are from 2016-2017 before the implementation of PlayFabParty.
The solution was to check every ~15 seconds in SharedGroup to see if the player had received an invitation.
Is there a better solution now that PlayFab Party is implemented to send information to another player before being in a SharedGroup or the same Network ? (I've scrolled through the documentation - Party - Chat - Shared Group - Entities - etc.).