This is the second month since the transition that I have paid my mastercard bill using a guesstimate because I am unable to view my statements. I keep getting locked out of the mobile app so I've never successfully logged in. I have tried 3 times to get through to customer service.Twice I've hung up after 60 minute wait, and yesterday after 90 minute wait. I can't find an email address for support.

Their phone queue message is such a joke! It seems that everybody is so excited (?) about Costco's transition to CIBC that they've had a higher than expected call volume. That's been the message for a month. Oh, and my call is important to them, of course.

I don't know if Costco is even aware of how badly the transition has been managed, and that CIBC can't even be bothered to allocate sufficient resources to support the Costco customers who are caught up in this mess. Woudn't Costco have a Service Level agreement with CIBC for telephone support? A 90 minute wait in a phone queue is ridiculous.

On vacation in Banff and Jasper and was picking up food yesterday at the Costco in Calgary. Was paying for groceries and realized they wouldn't accept our Citi Costco card or any of our Chase cards with no foreign transactions fees. People in line understandably were starting to get impatient. Luckily had my Ally Debit card saved on my phone.

Maybe this is widely known but just wanted to let people know.

EDIT: based on comments, sounds like Costco Canada (and other international Costcos) does accept Visa Citi Costco CC but not any other visa cards. Possibly have to use a chip card reader and not tap to pay.