Hi,Sorry for inconvenience, could you try to add "&edit" at the end of the application URL. Example:http://www.arcgis.com/apps/MapTour/index.html?appid=885535342d434c8c8e2314edbe228abc&webmap=456087342d434c8c8e2314edbe228def
Would become:
http://www.arcgis.com/apps/MapTour/index.html?appid=885535342d434c8c8e2314edbe228abc&webmap=456087342d434c8c8e2314edbe228def&edit
The expected behavior would be that you get redirected to ArcGIS Online sign-in page or have the following error "You are not authorized to access this application". If that's your case you should check on the application item page if you are still the application owner. Administrator of ArcGIS Online for Organizations can transfer ownership of items between user and only the application owner can access the builder.If you can access the builder or you are still the application owner but can't access it please email me the address to your Tour as well as your username and I will try to resolve the issue.