Most probably, you copied the wrong link, you might have copied the url in the browser. Please read the above document. ALL larger marketplaces have proper synchronization set up through specific export and import links. (.ics files) - These do not show in the browser.
I'm blocking dates on VRBO but they do not show on Houfy?
Please make sure you have VRBO synced into Houfy.
I added a reservation on Houfy ("Add Booking") but it doesn't show on Airbnb?
Did you import Houfy into Airbnb? Please make sure you did. Airbnb can not get any data from Houfy if you did not import the Houfy calendar into Airbnb.
What does the little sync button do?
The little sync button fetches data from the linked website. As far as I know, only Houfy, Airbnb and Tripadvisor have this.Once you have synced your calendars correctly, you should be all set!
If you list your place on Houfy and other websites, you can prevent multiple guests from booking the same dates by syncing your Houfy calendar with your other calendars. The "correct" way of Synchronizing Calendars: (assuming 3 sites) EXPORT Airbnb + VRBO and IMPORT into Houfy EXPORT Houfy + VRBO and IMPORT into Airbnb EXPORT Airbnb + Houfy and IMPORT into VRBO TIP: When doing this, keep the browser tabs open.