One suggestion is to try the rclone backend. You'll need to configure it before running duplicity, but it may work for you. It's in the snap you have and should be up-to-date. Search for rclone in the man page.
One suggestion is to try the rclone backend. You'll need to configure it before running duplicity, but it may work for you. It's in the snap you have and should be up-to-date. Search for rclone in the man page.