Known Issues or Errors
– Google Chrome
– Microsoft Edge
– Firefox
– Safari
The following browsers are NOT supported:
– Internet Explorer
Chrome, Edge, or Firefox (latest 2 versions) and supported OS. Ensure key inserted before setup. If the Security Key option is still missing, work with IT/Security to verify WebAuthn/CTAP2 or USB/NFC are not restricted.
Partially Registered FIDO / Passkey Token

Issue: In some cases, a FIDO security key (passkey) may become partially registered during setup. When this occurs, the key cannot be re-registered by the user without Support intervention.
Who is Impacted: Users attempting to register a FIDO / passkey credential when their account or subscription does not include FIDO / Passkey support, or when registration is interrupted before completion.
– “Try a different device. You already registered this device. You don’t have to register it again.”
– Registration fails immediately on retry
– The security key appears unusable despite never completing setup
This prevents subsequent registration attempts with the same physical key.
What Information Users Should Provide to Support: To resolve the issue quickly, users should provide:
– Screenshot of the error message
– Security key model
– AAGUID (if available)
– Browser and operating system used
– Approximate time the error occurred
– Verify whether the user’s license includes FIDO / Passkey support
– Remove the partially registered credential from the system
– Confirm entitlement updates if a license change is required
– Guide the user to re-register the security key successfully
There is no user-side workaround. Support cleanup and license validation are required.
Extract AAGUID
How to Extract Your AAGUID and Device Details
This steps below explain how to extract the AAGUID and device details from your FIDO/passkey security key. Support uses this information to confirm device compatibility and troubleshoot registration issues.


(We recommend using the following browsers, Chrome or Edge).
You should see a page titled ‘FIDO2 Key Data Explorer.
2. When prompted by your browser, select ‘Security Key’
3. Touch the key or press its button when it blinks
4. Enter your PIN if prompted
– Name (example: YubiKey 5 Series with NFC)
– AAGUID (example: d7781e5d-e353-46aa-afe2-3ca49f13332a)
– Supported Protocols
– Certifications (if shown)
Note: You may see ‘Failed or not a Token2 Device’. This is expected for non-Token2 keys and does not indicate an issue.
https://www.myexostar.com/knowledge-base/accepted-passkey-authenticators/
If your device is listed, include that confirmation when contacting Support. If not listed, still provide the AAGUID.
– The AAGUID
– Device name/model
– Screenshot of the tool results
– The error message you encountered during registration
Important Notes: The AAGUID identifies the device type, not you. No personal information is exposed. If a key is partially registered, Support may need to remove it before you can re-register.