Why was a 3D Secure 2 payment authorised with transStatus "A: Attempted to Authenticate from the ARes and without a challenge"?

transStatus: A is an authentication response from the schemes (Mastercard, Visa) to inform the merchant that this transaction attempted Authentication however, at this stage the issuer was not ready or able to perform a strongAuthentication (ie. OTP/Password). Such transactions, when the schemes step in, do come with a successful liability shift.

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