The red exclamation mark to the left of the tab name indicates that the reason for rejection is related to 3D Secure authentication.

The payment method is enrolled for 3D Secure and strong authentication (challenge) was required.

The Cardholder Authentication Status (“ Failed ”) indicates that the cardholder has not authenticated correctly on his or her bank’s authentication site (ACS).

For example, as a result of an incorrect entry of the authentication code, which led to payment refusal (reason "39: 3D Secure was declined for this transaction").