@roadmaster-stef
I think a direct transfer from MyRoute-app from your mobile phone to your TomTom is not possible. Therefore you have to do 2 steps.
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Save your route as *itn and/or *.gpx 1.1 format file on your mobile phone. This file will be stored in the download folder on your mobile.
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Copy this file from the download folder to your TonTom satnav. This should then recognized from your TomTom. I don’t own a TomTom therefore I can’t give you more advices.
If not already installed you can find a filemanager for this task for free in the google playstore.