Hello @Kerstin105. I've had the same problem. I had a new reservation after december 17th, at that moment co-host was primary point of contact and myself 'listing admin' as the system calls it.
I couldn't access the reservation, communicate with guests or get paid.
When I became aware of this issue I became main point of contact. Still I could not view that reservation.
As I understand it, the reservations made between dec 17th and the moment I switched to main point of contact will be unaccessible. The new reservations made after I switched back to main point of contact will be visible.
It is very frustrating, I've lost that payment because my co-host didn't receive it either. Waiting for them to reverse the deposit. Plus they are not communicating this properly, they should have sent a message to all users instead they are waiting for conflicts to accumulate. I am going to open an account in another platform in the meantime. It is understandable to have issues but 2 weeks and lack of communications are not acceptable. The support tickets I've opened were closed automatically by the system...