60433: Unsupported passkeys approval content type

This error occurs when you try to approve a Verify Passkeys challenge with a request content type that Verify does not support. The ApproveChallenge endpoint accepts an application/json body, and the Passkeys approval payload is sent as a JSON object.

• You sent the POST /v2/Services/{ServiceSid}/Passkeys/ApproveChallenge request with a Content-Type other than application/json.
• You submitted the Passkeys approval payload as form data or another unsupported body format instead of the JSON object that the endpoint expects.
• Your HTTP client, proxy, or middleware changed the request headers before the request reached Verify.

• Send the approval request as application/json. Set the Content-Type header to application/json.
• Build the request body as the JSON object expected by ApproveChallenge, including required fields such as id, rawId, authenticatorAttachment, and response.
• If you send the request manually, compare it to the Passkeys quickstart. If possible, use a Twilio helper library example for approveChallenge.update() to avoid incorrect request encoding.

• Verify Passkeys quickstart
• Passkeys Challenge resource API reference
• Verify Passkeys overview