I read through the link How to fix CalDAV|WebDAV problems per your earlier post cited below:
Both questions seems to me related and i think i had provided the information on the “WebDAV interface is broken” issues in another thread: Owncloud Web Interface and Desktop App Not Syncing. That link on the ownCloud documentation seems to be linking back here to the forums: How to fix CalDAV|CardDAV|WebDAV problems 1 which could be a good starting point for you.
Since, I am no longer getting the same error message as before. Please see my earlier posted image of the desktop app error message. Can the recommended solutions call out in the second link reference help in this situation too?
Please let me know and I’ll have my IT guys check it out.