QB Issue Resolution:

Amex uses the same log in as you use to log into the web site (at least mine does). Make sure you can log into the American express web site.  What version number of QuickBooks Mac do you have?

Select your amex account in the QuickBooks Chart of Accounts window. Choose Edit account. Click on Online settings. Choose disassociate.  Now go to banking->Banking set up and set it up again with your log in user name and password (the one that works on the web site).

Resolution for Issue 'Cannot download american express transactions to quickbooks.' available: Yes (Solved).
Source: Intuit Community forum.

Cannot download american express transactions to quickbooks.: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for express transactions
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Error Recovery for express transactions [Canada]
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