Thanks for visiting the Community, Credit Card AMEX,

I can provide information about connecting bank accounts.

Right now, you can only connect one American Express account into your QuickBooks Online company. Since connecting more than one American Express account might cause some syncing issues.

To know more about connecting American Express Business Card to QuickBooks, you may want to check this article: https://quickbooks.intuit.com/community/Help-Articles/Connect-your-American-Express-Business-Card-to....

If you have further questions concerning your QuickBooks Online account, please let me know. I'm always here to help.