Air calendar won't export to vrbo

[Gloria89]

Dear Fellow Hosts,

My Air calendar stopped syncing to my VRBO calendar. This same problem occured about a year ago, and I had to remove and reinstall the Air URL. I did that again, and now VRBO won't accept the URL at all. They say it's an Air problem. 

Does anyone know a fix for this?

Thanks so much for your help!

Gloria