Hi @Unverzagt, Marko ,
I got the same results as yours on my end. Both update and delete ListItem operations would work for the AAD app with Sites.Selected permission (added role write). Only create operation would not work. I even added role
"fullcontrol" for the app. Sitill create operation would not work.
I believe it's a bug for Sites.Selected permissions.
I submitted this issue in github: https://github.com/microsoftgraph/microsoft-graph-docs/issues/13334
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