I'm trying to implement an unattended script accessing files within OneDrive using Microsoft365R. I've setup everything like in the docs using the default app registration.
The interactive flow with auth_type="device_code" works without issues:
odb <- Microsoft365R::get_business_onedrive(auth_type="device_code")
But when trying auth_type="resource_owner" like shown in the docs here, I get the following error:
odb <- Microsoft365R::get_business_onedrive(tenant=tenant, app=app, username=user, password=getPass(), auth_type="resource_owner")
Error in process_aad_response(res) : Bad Request (HTTP 400). Failed to obtain Azure Active Directory token. Message: AADSTS50126: Error validating credentials due to invalid username or password.
My guess is, that the default app is missing some privileges to use the "resource_owner" flow. Can someone point me to the right direction on how to get the resource_owner flow working?
(Using Service Principles is not a solution for my setup, but I did also try it with a dedicated service account and it was not working either)
