OK, you are using a work-around for customizing the vault icon. The forum topic that described that work-around also included a warning that by using this method, you have to give up the “Launch” functionality.
Second, to prevent auto-filling from occurring on outlook.live.com, you need to change the URI match detection for URI2
(login.live.com) to Host. This is because the way that matching is done when there are multiple URIs. You may wish to vote for the following feature request, if you want the “Never” option to have the effect that you were expecting: