If you purchased a My Cloud Home device then see the following subforum, this subforum is generally for the single bay My Cloud which is different than the My Cloud Home Device.
If you have a single bay My Cloud device, WD removed the WEBDAV capability several years ago from the MyCloud.com web portal. One can use the forum search feature to find past discussion on attempting to re-activate WEBDAV on a single bay My Cloud.
https://community.wd.com/search?q=WEBDAV%20category%3A105
If one has the older first generation v4.x single bay My Cloud there is the following unofficial mod (only for first gen v4.x single bay My Cloud firmware).
