To sync LeCoach with Intervals:
Go to Settings - Integrations and press 'Connect with Intervals'
A new screen / pop-up will open where you need to log in to Intervals and accept all connections. Note that your browser may block this popup.
After you have connected Intervals we will do a full sync of your historic data. This may take a while.
If you miss activities that are shown in Intervals but not LeCoach this could be due to Strava settings. Read the solution here