Thx for this update, I also moved my smb sharing to a webdav sharing on MacOS, this avoid me to create a "Standard User" to manage the authentication on latest macOS version.
Skybox is connecting fine to my webdav share as soon as I deactivate the basic auth.
Will it be possible for you to manage BasicAuthentication ? Thx for the work
EDIT: Do you manage Digest Authentication or something else ?