Are you on windows terminal, right?The command that you tried is for Linux/UNIX. There is a difference.
On Win you can install Git and it also will install bash terminal which is the same as in linux.
Anyway the command that you tried sends a PROPFIND request with a body that contains XML with a list of properties that you wish to receive.And the list contains only one property resourcetype which is a content type like text/plain. For sure you wish to get all fields like name and size.
You can simply omit the body then it will return all default props:
curl -v -i -X PROPFIND example.com/webdav -H "Depth: 1" The Depth: 1 header means to list the folder only but not it's subfolders.
Here I collected samples WebDAV with curl for scripts and command line