A little over two years ago, Strava stopped allowing embedding Strava Route pages on external websites. This added an additional click to our website when Ride Leaders would post Strava Routes to see the route map and additional details. This has been an on-going discussion over at the Strava Customer Support forum as to why they removed this capability which has fallen on deaf ears.
A third-party developer, https://www.doogal.co.uk/StravaRoute.php, created a widget that now allows you to embed Strava Routes on your website. Hopefully it continues to be maintained and developed as I have added it to our website. Now, when you post a Strava Route the map with show automatically, just like Garmin Connect Routes that are posted by our Ride Leaders.