On looking into this further. The problem seems to be how the data is handled by the POST in cURL. All newlines are removed, which breaks the iCalendar recurrence block.

I have been using: "curl -H <authentication headers> -d <xml data> <url>" to POST the data, which I have as a text string.

Is anyone able to give me a pointer as to make this work better in cURL?

I tried url-encoding the data, which broke the XML. I also tried using the "--data-string" flag, but this doesn't seem to work in my version of cURL.

Thanks for any help & best wishes