I checked your Strava Ride and something happened here (see screenshots), do you remember what it was? Although Strava recorded that you did the route, the Zwift Game doesnt like any deviations. Same thing happened to me I remember exactly what I did, hit U-turn by accident on my keyboard, I turned around immediately back on to the course but to no avail, Strava also shows I completed the route but Zwift Support gave me the same sad story they gave you. Luckily my ride was much shorter Three Sisters 120mins only
P.S. I wont bother listening to Customer Support either as per Ben’s post here he completed the route and probably got the Mega Pretzel badge too. I just double checked the Zwift Game again and the badge is there to be earned.