'Not Permitted' for web form list

I’m trying to grant Customer access to both a standard web form (/issues) and to a custom one. Both forms are configured to show lists. I have a test user created which only has the Customer role assigned. When this user logs in, it is able to create a new document for either doctype but, on the list view, it throws a ‘Not Permitted’ error.

I’ve cleared all caches and confirmed that the doctypes have a permission rule allowing Customer to create, read, and write (for documents they own). Is there maybe something at the website level that governs list views?

Resolved: There were a couple of Linked doctypes that didn’t have Read (at minimum) permissions for Customer role. These fields weren’t used in the form but access to them is still required.