Once you have synced your calendars correctly, you should be all set!
DANGER: You are listed on Tripadvisor, Airbnb, VRBO and Houfy; above example shows just 3 sites. (Airbnb, VRBO and Houfy) The screenshot below 4 sites! Make sure you have everything synced correctly.
Houfy says: can NOT import this link?
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.