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Also Protonmail supports both U2F and FIDO2. Introduced october last year [0].

[0]: https://proton.me/blog/security-keys

Yes, but in order to enable it, they require that you enable an app first.

I can only assume that this tactic is usually an attempt to maybe get your phone number, depending on which phone-based method you choose. Which is especially weird for ProtonMail.

It does not require a phone number.

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