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How can I see the permissions for a SharePoint Add-in App registration?
I once created it with https://contoso.sharepoint.com/_layouts/15/appregnew.aspx and gave it permissions with https://contoso-admin.sharepoint.com/_layouts/15/appinv.aspx.
Now I need to check what permission I gave it. I can get to the overview the link below, but cannot find the permissions.
https://contoso-admin.sharepoint.com/_layouts/15/TA_AllAppPrincipals.aspx
To look up registration information for an add-in that you have registered, go to http://<SharePointWebsite>/_layouts/15/AppInv.aspx.
To see a list of registered add-in principals (permissions), go to: http://<SharePointWebsite>/_layouts/15/AppPrincipals.aspx
Official documentation: Retrieve add-in registration and add-in principal information
Additional Reference: How can I view a list of applications added by AppRegNew.aspx?
As far as I know, there is no way to check the permissions of SharePoint add-in. The AppPrincipals can only view the app you registered but cannot view the permissions of the app. If you forget what permission you gave, I would suggest you create a new one.
