20159: Invalid Signature

This error occurs when the JWT provided to the Twilio API has an invalid or mismatching signature.

The public key referenced in the JWT does not match the actual private key used to sign the token.

• Ensure the private key used to sign the JWT corresponds to the public key identifier referenced in the token.
• If needed, validate the JWT's structure and signature using standard JWT tooling before retrying.

• Access Tokens
• API keys overview
• Public Key Client Validation Quickstart