Family wont install

Im trying to attach a device to my child's profile in Norton Family.  It wants me to install Norton Family on my computer (win 10). I have done that (several times). I confirmed it has installed but it still states " Norton Family is not installed on any of the devices associated with this account.".I've tried to uninstall Norton Family so I could try again - but I cant uninstall it now - as it doesn't accept my username / password during the uninstall process.  Help!