I had a very similar issue and wanted to share my solution
I could not create events/appointments in my calendar, they would just not show up anywhere after I created them, as if they were lost in the process
no matter how often I tried
In the process of creating an event or appointment you can chose in which "calendar" you want to save it
I have "Kalender - Outlook" and "Geburtstage - Outlook" for example. After I changed from "Kalender - Outlook" to "Geburtstage - Outlook" it finally saved my event. I deleted that, switched back to "Kalender - Outlook" and saved my events. No events disappearing anymore.
So I guess I was lucky and I didn't have to reset my device. Maybe this solution helps others too.
I could not create events/appointments in my calendar, they would just not show up anywhere after I created them, as if they were lost in the process
no matter how often I tried
In the process of creating an event or appointment you can chose in which "calendar" you want to save it
I have "Kalender - Outlook" and "Geburtstage - Outlook" for example. After I changed from "Kalender - Outlook" to "Geburtstage - Outlook" it finally saved my event. I deleted that, switched back to "Kalender - Outlook" and saved my events. No events disappearing anymore.
So I guess I was lucky and I didn't have to reset my device. Maybe this solution helps others too.
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