Authentication fails when using discoverable credentials created on external NFC authenticators that do not support ClientPIN.

[jy]

Steps to Reproduce
- Use an external NFC authenticator that does not support ClientPIN.
- Visit Webauthn.io on an Android device.
- Register a discoverable credential using the NFC authenticator.
- Attempt to authenticate with the newly created credential.
- Android displays: "Something went wrong" and hangs there.

Expected Behavior

Authentication should succeed, similar to behavior observed on iOS.
If ClientPIN is not supported on the authenticator, the NFC interaction should be sufficient to establish User Presence (UP), allowing assertion or registration to proceed.

[John Bradley]

Fido2/Ctap2 is not supported at all over NFC on Android yet.  

What you are seeing is U2F support, and that is non resident only.  

Support is coming soon.  There was a release but it was withdrawn do to issues it caused with existing U2F deployments.  

Sent from my iPhone

On May 9, 2026, at 12:26 PM, jy <kar...@gmail.com> wrote:

Steps to Reproduce

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[My1]

at least as of a few days ago, I had it working, partially.

from what I grasped specifically needed support for extended length encoding on the applet selection APDU which causes several FIDO devices to crap out including ones clearly marked as certified (e.g. from Cryptnox or older Token2 devices)

https://issuetracker.google.com/issues/406833082#comment29

not sure where applet selection using extended length is required for CTAP2 because I heavily hope non-compliant devices wouldn't get certified, and as far as I read the CTAP2 standard, it only asked for extended length in CTAP2 commands, not the applet selection.

To view this discussion visit https://groups.google.com/a/fidoalliance.org/d/msgid/fido-dev/900BBC63-019E-4902-B16C-9FB6848D43A3%40ve7jtb.com.