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by lstamour 2565 days ago
Before this, both LastPass and 1Password said they supported U2F via Duo, but Duo only supported one key, so I could never use it.
2 comments

If that's the case, it must have changed at some point. Lastpass and Duo both support multiple U2F keys, and have for at least a couple of years. I have two keys registered with Duo for login at my school and also through Lastpass's non-Duo U2F support.
My college uses Duo and it has no such restriction, if you tried this recently and couldn't add more than 1, it is probably set by LastPass/1Password.
Duo Free used to have a restriction of one device, but it seems for U2F they now require one of their paid plans: https://duo.com/product/trusted-users/two-factor-authenticat...
I didn't even realize they had a free tier, makes sense.