QB Issue Resolution:

No sure what changed, but American Express transactions are now automatically downloading/updating through the Banking dashboard. Thank you Intuit and American Express !

Resolution for Issue 'For the last four days, there’s been an orange exclamation point over my American Express account. Updating it does not resolve it. Is the issue on QBO or Amex side ?' available: Yes (Solved).
Source: Intuit Community forum.

For the last four days, there’s been an orange exclamation point over my American Express account. Updating it does not resolve it. Is the issue on QBO or Amex side ?: 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 American Express transactions
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Error Recovery for American Express transactions [Canada]
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