The Strava integration works a bit differently than other integrations as the user themselves need to authenticate and give SalesScreen access to fetch their data. It is not the organization that owns the data, so each user need to explicitly give SalesScreen access.

After an user has authenticated their data will flow over to SalesScreen in real time.

To allow users to authenticate their Strava account the intergation must be activated under Manage -> Settings -> Integrations -> Strava.