@Erik1242 Is your AirBnB calendar availability set to "All future dates" ? Is the VRBO calendar set for the same time period? The longest period that I can enter on VRBO is 24 months, which is not the same parameter as "All future dates" that exists on AirBnB.
If your 2023 bookings are not transferring to VRBO, manually enter the reservation when it occurs until VRBO resolves this technical issue. I know that this is a pain, but no one should rely on programming synchronization between platforms that are constantly being tweaked by bored, careless programmers who do not test changes adequately.
VRBO made changes to their calendar setup in October. Ever since, I have had ongoing issues with the calendars and the calendar synchronization on that website. VRBO's CS has very little understanding or power when it comes to technical programming issues.