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andreaslang It's not a grommunio-sync issue, your device behaves like that.
i understand... but its the "stock" calendar app on android samsung devices... (galaxy fold 6).
For sure thats not your problem if it doesnt work correct but there are many many users using it i think. And using Outlook on Android isnt a good way with grommunio too, right?
I was using exchange before and i cant remember having this problem there.
So i dont know if Microsoft build a workaround for that or why it was working with exchange and android.
For sure i can create one account per calendar but that would cost many licenses :-(