Click on the "Connect with Strava" button to authorise the data collection app for VSCC and VSTC challenges
You must also be part of the appropriate Strava clubs for each challenge. That is VS3L, Grimpeur, VSCCTT and VSTC.
Links to the Strava clubs can be found via the Strava button on each challenge page.

Authorising the app means that the following information will collected and used in the creation of the various VSCC leagues and competitions that rely on Strava data such as VS3L and Grimpeur challenges:

Strava Club member list. Names, athelete_id, avatar, lcoation. No age though.

Segment information. Segment name, elevation, distance etc.

Segment efforts. Athete_id, time, power, whether KOM or PR etc.

Click here to find all your currently authorised apps it is also here that you can revoke authorisation.