Greetings, leenga.

I'd be happy to help you connect your Personal American Express Card with QuickBooks Online. Let's get you connected.

So far, we haven't received similar issues reported with connecting American Express Card in QuickBooks Online.  You may want to use  other browsers which are compatible with QuickBooks Online:

• Google Chrome.
• Mozilla Firefox.
• Safari.

Also, you can access your QuickBooks Online company using private browsers. You may use these shortcut keys:

• Google Chrome, press CTRL  + Shift + N
• Mozilla Firefox: press CTRL  + Shift + P
• Safari: press Command + Shift + N

You may find this article helpful: Connect your American Express Business Card to QuickBooks.

If you still can't connect your personal card, I'd suggest reaching out to our QuickBooks Online Support to investigate this further.

1. Sign in to your QuickBooks Online Company.
2. Click (?) Help at the upper right corner.
3. Select Contact US on the pop-up.
4. Enter a brief description of your concern then hit Continue.
5. Click Get a callback.
6. Enter your contact information.
7. Select Call me.

Should you need more help in connecting your Personal American Express Card, please let me know. Have a good one.