All Cielo codes
CIELO · RETURN CODE

Cielo
AI

Not authorized: authentication was not performed (the cardholder did not complete authentication).

Cielo saysSoft decline
AI

Not authorized: authentication was not performed (the cardholder did not complete authentication).

What it means

Authentication failed

The shopper did not pass, or did not finish, the 3-D Secure challenge.

What to do

Let the shopper try again or choose another method. Check 3DS drop-off if this happens often.

Worth retryingWho can fix it: The shopper
Yuno response codeAUTHENTICATION_FAILED_THREE_D_SECURE
Source:Cielo docs — Códigos de Retorno padrão ABECS (API E-commerce Cielo)

Reference only. Codes and descriptions come from each provider's public documentation. The Yuno response code is a reference mapping and does not guarantee how a specific transaction is processed.