@Erik1242
It's a common problem with VRBO. I've resolved to quickly checking the VRBO calendar after every booking from another platform. Other platform bookings often don't show up on the VRBO calendar, so I just enter it manually.
Having said that, I haven't had a booking from VRBO in over a year, so it probably doesn't matter.
I think the booking problem with VRBO is just that Airbnb runs circles around them and books everything up before VRBO has a chance. I suspect that if I blocked Airbnb dates, I'd start getting a few bookings from VRBO. But I'm not very happy about all their hidden charges, so I'll stick with the others for now.
Still, our VRBO listing shows up on page 2 or 3 in a Google search, so it's free promotion, even if nobody books it.