“509” to operation CalDAVWriteEntityQueueableOperation.

Hey,

Just recently Ive started to get an issue where I couldnt create events in my icloud or macbook calendars without getting the following error.

“509”

to operation CalDAVWriteEntityQueueableOperation.

I can create them on my phone fine. I have deleted the calendars folder in /Library, ive logged out and back into all my devices but still nothing works.

Any suggestions?

Regards