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@kev @Edent The problem with the multiple Yubikeys solution is that you need both/all of them on hand when you setup a new service - no way of registering all using just one - so no keeping the backup in a disused lavatory in a basement with a sign saying "beware of the leopard".
That's if the service supports multiple- the fact on Mastodon I have my phone, Windows Hello and 2 Yubikeys all setup on a free service for 2fa and $ limit you to one device is astonishing