Dear powerapps community,
I am searching for a solution for a filter for my gallery.
I have the following:
A gallery of an form. The form itself is about new employees and their onboarding proces.
Some of these questions of the form were multi selects. Like 'in which department will the new employee start?'
In my gallery i can find the list of the new employees, name, department and so on.
It is easy to make a filter on name, which is just an input, the title collum.
But it seems a lot harder to make a filter on the multi select collum.
As you can see here, i have the gallery and above 2 options for filtering. A searchbox for the title (the name of the new employee) and a multi select box

But if i change the formula of the gallery, where i should normally put the filter function, i get an error on the '=' sign.
But i have no idea why or how.

Is there any solution or maybe an alternative way to filter the gallery on department (Afdeling in Dutch).
Thank you in advance
Greetings,
Miguel