@Louise810 Non communication is frustrating, but often there is a reasonable explanation for it.
I also require info on all guests on the reservation, and had a hard time getting it until I added the requirement to my house rules. Guests can add the info to their booking request message, and you can require it before a booking will be accepted. If guests send a booking request without this info, it's a signal to me that they haven't read my house rules.
In the booking acceptance message, I recommend the app to guests, for ease of communication etc. I also include details on the check in process. You can advise your guests that a firm check in window is required, for them to be able to access the house.
For now, definitely call or text the guest.