A route from? to?
Maybe from the UK to mainland Europe? I don't think the Brexit is already in charge, but maybe you have set ferries to "forbidden"?? Unlikely that only is disabled on TomTom, not on HERE maps
Or a map in between (e.g. UK- Austria, and France as starting point on mainland) is missing or corrupt?
Anyway, think logically and look closely why the starting point is isolated. The error message is an important hint.
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