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AMEX Knowledge Check

I think this is how banks are supposed to work.

This works better in case for fraud detection as you would know what mode did the hacker use to make the transaction so that you can clean up better.
Axis/SBI/any other bank sending same codes to both places might confuse the user and they would never know what device was targeted.
 
Knowledge - knowing 2 OTPs that amex sends
Wisdom - staying away from amex and choosing mental peace

Floating White Cat GIF by lilcozynostril
 
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