We value your efforts in taking the necessary troubleshooting steps, including trying different browsers and contacting chat support, Bello.

At this point, I recommend reaching out to the QuickBooks Online Live Support team again, since you can successfully find the transaction in the specific Amex account, but not via the global search. This step ensures your situation receives the attention it needs from specialists who can address more complex technical issues.

Feel free to click the Reply button if you have more questions.