I tried without success:
Description eq 'value Title'
Train number eq 'value Title'
(where value title is the title of a Planner task, and 'Description' and 'Train number' are columns from my Sharepoint list)
However I succeded with:
Title eq 'value Title'
How to make the two first queries work as well? I saw some posts of people writing _x0020 but it is not very clear to me. Many thanks.