@rfc2822 turns out there is a setting in the privacy guard to restrict app from modifying the calendar.
And the calendar storage app had no permission to do so 🤦
I probably took the permission, or maybe it was never set. Not sure

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@rfc2822 I’ve found some documentation that further helped me somewhat in moving forward but have found myself with the same results.

Howto guide by Disroot

I still find myself with the message “Server not found”. Perhaps servers are down during the night for maintenance as I usually try to connect after midnight.