Since a recent Microsoft Office update you get a warning pop up when opening Office files on a WebDrive/ WebDAV vault. This is due to the fact that Microsoft wants to move away from the Basic Authentication which is used for WebDAV connections.
Regardless of the warning, you can click the "Cancel" button in the warning and eventually (you can get multiple warnings) you will get to the file and you'll be able to edit and save it.
As an alternative, you could:
- Import the vault locally instead of via WebDrive/ WebDAV
- Edit the Office files directly via myNomadesk.com