The restriction is wit TomTom Go app, it doesn't allow upload of routes.
you can use routes you've created in myroute-app within Sygic & Navigon navigation apps.
I use it with Sygic and there is a maximum of 48 way points. Make sure to add as many way points as you can as when you send the route to Sygic with few way points it seems to reinterpret the route and send you on a different path. i.e. if you mapped out a nice back road with just a few waypoints once these are sent to Sygic, Sygic will work out the fastest (or whatever setting you have Sygic set to) route between those waypoints and ignore your route on the map in MRA.
In Myroute-app mobile select "Tracking", choose your desired route, then when it displays touch the Arrow/pointer in top right of screen. You will then get the option to open in Navigon & when you select Navigon it will open the Navigon app & load your chosen route into it.