I have set up 2 WordPress sites, each with an EA calendar. Both connected to the same primary Google Calendar. I use 2 different Client IDs to connect (but have also tried using the same ID). The idea is, that a booking in one site should block the timeslot in the other site as well. (There is only one worker). It works brilliantly some of the time with sync in "all directions" But frequently synch stops for one or both sites. Are there any specific things I need to do to support the 2-sites setup?