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I was in the exact same boat.
Saw that Capital One coded Walmart as grocery, got excited and the next time I used my grocery card (BofA custom cash) to pay, and nope, it was code as discount store so no bonus.
Capital One’s coding (at least whatever they display in the app and also the website) in general is very broad/generic and not very helpful.
They show so many things as “other services” when other cards actually tell you what it is specifically.
The best I have seen is the Wyndham business earner card in terms of coding precision.
It tells you the exact merchant code along with the description.