Hi,
I’m pretty sure my account has all the necessary permissions, in Facebook Business Manager I can see that my Facebook acccount has full control over the page.
And secondly, I tried posting a photo using the page id instead of selecting the page from the dropdown field in the Upload a Photo module, and it worked so the required permisions should be there.
But it does’nt matter, since all the pages magically appeared today(the question was posted a day ago) without changing anything on Facebook Business Manager, so my guess is it definitely is a Make problem.