Use the Graph API to get an empty list of Sharepoint files

Question

My Application account has applied Graph and Sharepoint Sites.Selected permissions, and the administrator has agreed

Sharepoint Site has configured app permissions

I can use the Graph API to access Sharepoint Sites and drives

But get the root folders and files returns an empty list ,Is my permission insufficient?

I'm referring to this document： https://marczak.io/posts/2023/01/sharepoint-graph-and-azure-sp/

In his documentation example, he can get folders and files, but I can't

Answer 1

Sharepoint is deprecating ACL. Please Validate that permissions were assigned properly read/write in the Sharepoint Site that has configured app permissions.

If not, permissions were assigned. Please ask to add permission read or write permissions to service principal using Permissions API or PnP are my recommended way due to sites.selected. Example:

1. via Graph API /sites/{siteId}/permissions endpoint
2. Grant-PnPAzureADAppSitePermission -AppId "yourAppID-75a7-47e3-bdb6-b763851c61b6" -DisplayName "TestApp" -Permissions FullControl -Site https://contoso.sharepoint.com/sites/projects https://pnp.github.io/powershell/cmdlets/Grant-PnPAzureADAppSitePermission.html