Hey @sfarma, 
Thanks for your post! You cannot sync activities or adventures from FATMAP to Strava as they do not contain any time data. You can, however, import a GPX route file from FATMAP to Strava.

Create a Route from GPX:
You can create a Strava route from a GPX file builder by selecting Dashboard from the top navigation menu on the Strava website > My Routes > Create New Route. Click the upload button (right of the search bar) and choose the GPX file you would like to use to create a route. Once the file has been uploaded, you can adjust the waypoints on the map or edit your route preferences as necessary. Select Save once you've finished.

I hope this information is helpful.

Thanks but this isn’t a solution to my original post, which is about activities not routes.

Unfortunately, there is no auto-sync of activities from FATMAP to Strava (Only Strava to FATMAP).  You can manually export FATMAP activities as ROUTE files, but you won't be able to upload them to Strava as activity files.

I tried to load an Activity GPX which I archived in preparation for the Fatmap closure.  However, when I try to open it Strava will not do this as it has not time  data.  Is there any way the GPX files saved from Fatmap can be made to show in Strava.  I'm pretty sure I remember going through a saved "Adventure" on Strava when linked to Fatmap.