On which date you’re looking for this connection? Maybe the schedule is just not uploaded yet.

You can always add a train manually in the app:

To add a train manually, do a search in the planner, scroll down and tap on "Add it manually” that you find below. If your station is not in the app, then link to add it manually will appear if no station can be found.

It's in the planner ar "St Malo”.

Spelling of such names varies. It could be St, St. or Saint/Sint/Sankt/etc. and there could be a dash after that or not. In the app, you can however just type "Malo” and it will then also find it.