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How to fix Add-PnPApp failing with an Access Denied error

This was a peculiar case! An issue I hadn’t run into before, and luckily a disturbingly simple fix. But first, let’s set up the scene: We were running a long-ish PowerShell script using a Global Administrator account. One part of the script was supposed to add and deploy a couple of SharePoint apps. But while running Add-PnPApp, we ran into errors: Add-PnPApp -Path $path -Scope $app.Scope -ErrorAc… , Error: {"error":{"code":"-2147024891, System.UnauthorizedAccessException","message":{"lang":"en-US","value":"Access denied. You do not have permission to perform this action or access this resource."}}} […]