[darkpicnic]

I changed to CloudKit and changed the extension as well to ".md". I was able to add a calendar event once or twice, then the same issue came up again where it could not add event and asked me to email support. I've deleted the app and reinstalled a few times. Anything else I can try?

[EduardMe]

I'm looking into the event creation problem. Restarting should usually help at least temporarily.