That mail wasn't sent by MyRoute-app. It was sent by a person: the sender shown is "rainer.henig". When you open a trip, press Share and pick Email, the website opens your own mail program with a ready-made message: the trip's name as the subject, a short line ("A 8-day trip of 3,132 km on MyRoute-app. Take a look") and the link to the trip. That's why the link works.
So someone (maybe you, from another address or device?) shared your trip "Offroad trip through 5 regions of Italy" by mail with you. Nothing is wrong with your trip or your account, and you can ignore the mail.