I'm able to send invites using Rooms.LaunchInvitableUserFlow. The invited user gets a notification to join the game, as expected. The app launches when the user clicks accept on the notification. RoomInviteAcceptedNotificationCallback should trigger when the user launches the app through a notification, but it's not being called. It looks like the Notification_Room_InviteAccepted message that should trigger the callback is never being sent.
I've also tried checking the LaunchType on startup using:
LaunchDetails launchDetails = new LaunchDetails(CAPI.ovr_ApplicationLifecycle_GetLaunchDetails());
if (launchDetails.LaunchType == LaunchType.Invite)
{ ... }
But the LaunchType is always Normal instead of Invite.