There are two settings that apply to whether or not the property will appear online.

Firstly, if the property is set to Long Term under Owners & Homes  > Property Name/Location, it will not appear online in your regular search results.

Secondly, ensure that the checkbox labeled Show on MC Website is enabled in Owners & Homes  > Quick Property Setup or Owners & Homes  > MC Specific Property Details (these two fields are synchronized).