Hey Jasper,
If you are not able to see the button which leads to page
Pls check the page access rules.
And,
If you are not able to see the data,
Pls check the entity access. It's probably because of the access rule.
Hope it helps!
HI Jasper,
Can you Add a Screen Shot ?
third picture
The issue could be inside the XPath constaint in your entity security, an easy way to test this is to temporary remove it.