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by mihaigalos 909 days ago
Because there is a Yubico server involved in the auth process. No internet access means you cannot authenticate.
1 comments

Why is there a Yubico server involved? Why can't it use public and private keys? What does the Yubico server do?

Hopefully this isn't using Yubico OTP, which is phishable:

https://developers.yubico.com/OTP/