You’ll need to create these credit card accounts as sub-accounts in QuickBooks, ydemirkaya.
This way you’ll be able to connect both of them at the same time. Here’s how to create a sub account:
Do these steps for each of the credit card involved. For additional details, please check these articles:
Be sure to visit the Community space if more assistance is needed.
Thanks for sharing to us the steps you’ve taken and its result, @ydemirkaya.
Before connecting the accounts, first check with your bank how transactions are downloaded into QuickBooks. This information is essential because it’ll guide you in the setup process.
If they import transactions to only one, connect the parent account. If it downloads to each of the individual accounts, link all of the sub-accounts.
As long as the credit cards are properly setup in QuickBooks, you can input the same login credentials used in your bank. For detailed instructions about the setup process, I suggest following the articles provided by @MikiD.
Here's an article that contains some tips for forming connections and keeping the bank feeds organized: Online Banking.
If you have any clarifications or other concerns, post a comment below. I’m here to assist further. Have a good one.