When implementing WebAuthn authenticator registration on my site, I ran into the issue that during the attestation / registration process, Safari returns a modal saying "The operation cannot be completed" after I attest using one of my devices. The process works on other browsers, but fails on Safari.
1 Answers
This is because Safari fails WebAuthn registration for any attestation request asking for an additional attestation statement via the attestation conveyance.
I couldn't find this documented anywhere, but I played around with the Auth0 WebAuthn registration debugger and came to the conclusion that the "attestation" field was what was causing this popup. I would assume that Safari is being super defensive against any additional data being given about WebAuthn enabled devices via the protocol?
But in summary, ensuring:
navigator.credentials.create({
...
attestation: 'none',
});
worked to prevent the popup for me.
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