In your case they told you it doesn't work.. I have been on the phone with them for the past 50 minutes and they say that on their end it works, that they don't understand why on mine it doesn't... what a waste of time and energy really.. they should get their developers involved and solve those issues.. amazing they have no one.. 

Here's an update to my latest progress on a possible short-term workaround. I have a Zettle POS terminal that PayPal sent us a while ago. I just connected Zettle by PayPal to your QuickBooks Online company from my.zettle.com but it appears it can be done from Quickbooks here: https://app.qbo.intuit.com/app/appcenter/myapps

Once the data is synchronized I will hopefully will be able to process any type of credit cards and other payment options as well.

I have just experienced the same issue. In my case it's not such a big deal because Intuit has declined every card transaction I have attempted since I opened my account. If I can't process a transaction I suppose it's irrelevant that I now can't add new cards. Contacting customer support is an exercise in futility. Replies by Intuit in discussion forums are predictable, impersonal, repetitive and likely generated by AI. 

I am having the same problem.  I have spent over 4 hours on the phone with customer service and no resolution.  Has anyone had positive resolution with this yet?

Hello, I have had the exact same issue with 2 customers now in the last 2 months. This is new after 2 years of using quickbooks. I also called them and they were no help. Any solutions yet?

SOLUTION! 

I had this work... I have had 2 customers suddenly have issues with cards that never had issues. Its VERY inconvenient and not something I am going to want to do every month for a handful of customers with monthly payments (so i hope quickbooks fixes this glitch in their system fast!). 

** Send an invoice with the option for them to pay via card in the invoice. Either have them do it, or I actually just sent it to myself ( i have this setting already for invoices) and entered the card info manually from the invoice and the transaction was sucessful. The EXACT info will not add to the customer profile within quickbooks which is crazy. QUICKBOOKS - please fix this issue. I have 150+ reoccurring monthly CC payments and can not continue to do this manually....this is why I choose your payment services, for ease, but this is becoming painful and very inconvenient. 

Thanks.

I am also experiencing this issue as well. It is extremely frustrating. QuickBooks support is useless.... you spend hours on the phone with no resolution. This should be considered and urgent matter.