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I'm glad in Canada, debit is tied to Interac which is a separate entity from Visa and Mastercard Debit which is targetted at people who want to make online purchases without requiring a credit card. So all debit cards work at Costco Canada, but in terms of credit cards, Costco Canada went with Mastercard. A little baffling why Costco USA and Canada went their separate ways when moving on from AMEX.
 
They have yet to fix the issue at my Costco. I was in there yesterday... same error.
Funny thing is Samsung Pay on my Note 8 worked when I used the MST method instead of tap. NFC gave same error.
I'd be complaining to Costco's CS and hopefully they will fix it as it works at most Costco so something is going on with your location. Maybe try a different one and see if it works at that location if there is another close by.
 
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I'd be complaining to Costco's CS and hopefully they will fix it as it works at most Costco so something is going on with your location. Maybe try a different one and see if it works at that location if there is another close by.
I do... every time. There's another Costco about 7+ miles away that I could try. Kills the convenience as the one I regularly go to is 2 miles away from my house.
 
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