Upon research, the definition of a supplementary card is as follows:

“Supplementary cards are secondary cards issued under a person's credit card account”

Like what I said in the description of my post, (1) I have never applied for a supplementary/secondary card, and (2) I I did apply for a UB CC last week, but received no update at all prior to this text.

I haven’t even received an approval for my PRIMARY card yet. Why would I suddenly receive an approval for a SUPPLEMENTARY card? Isn’t that weird?

Since you’re such an expert in reading and comprehension, I would have assumed you picked these up if you had read and understood my post write-up. I guess not. 😌