Apple Wallet and Booking.com

I am having particular problem with Apple Wallet and Booking.com. I have an iphone Xs running IOS 14.6.

I have made two bookings with AirBnb and have successfully added the passes to Apple Wallet. Likewise I planned a trip for 2022 and have 6 stays on Booking.com that I have added to Apple Wallet. No I am booking a trip for the fall and have 9 bookings I want to add from booking.com. I was able to do the first few but then got an error message saying "Data Problem" we're unable to add your booking to Wallet right now. Please try again later." I thought perhaps there might be a limit on the number of stays you can add so I deleted some of the stays for my 2022 trip and tried again - same error message. The stays that I did have in Wallet and deleted I now cannot put back. I contacted Apple and they feel that it is not an Apple issue and told me to contact Booking.com. Booking.com asked me to try another phone and try deleting/reinstalling the app - I have done both - this has not fixed the problem. I am not seeing this behavior with any other wallet passes as I tried deleting my AirBNB stays and re-adding them without a problem. I am now at a loss as to what is going on as Booking.com has not solved my issues