Hello,
I've encountered very popular error, but in my case it's really strange. I got a lot of "You don't have permission to view this data. Server Response: failed: Something went wrong" errors, while trying to access my sharepoint list while creating app. It's strange, sine error comes for only few controls, while other works fine, despite being based on the same datasoure (SP list).
I am also the owner of sharepoint site, on which list is located and I've created this list myself. Usually restarting app in studio fixes this, but it's really annoying.
Do you have any clues, what could be causing such a problem? Is it related to network connection or cybersecurity policy? Or is it just a bug?
