You could try getting them to give you a physical security key, they used to supply them and I think still will if you can't use the app (just say it doesn't work on your phone). I have one and the website still works with it.
Thanks, I was thinking of phoning and asking, but good to know there is some point in waiting in the queue to talk to someone!
Thanks, I was thinking of phoning and asking, but good to know there is some point in waiting in the queue to talk to someone!