Showing featured images from a page in a grid layout on my main page

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Hi, I hope this is the right place to ask this question.
I use wordpress with Mai Theme for a company website.
I have setup the main page as a static page with content areas.
In content section #2 I have set up a grid, which shows the various pages as blocks. Now I want to add the featured images from each page to that grid.
After some searching I came up with this code:
\[grid content=”page” parent=”2245″ columns=”4″ exclude=”798″ number=”all” xs=”12″ sm=”6″ md=”4″ show=”title, more\_link, thumbnail” more\_link\_text=”Meer info” align\_text=”center, top” class=”top-xs-xxl”\]

I have also forced update on the thumbnails to make sure they are generated properly.
The images do not show when I publish the website.
I have been googling a lot but only came across this problem with “Posts” , not with a static pages.

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