I have not been able to connect to my American Express card for 20 days. Everything looks fine on American Express side but intuit is giving error message 590.

Thank you for mentioning your bank and sharing the error code you're getting, Rickd. I'll share some troubleshooting to help you link your bank account successfully.

Error 590 indicates that something unexpected has occurred on the bank's side that we cannot address. We're unable to determine the specific issue with your bank, but please wait a few hours since it will resolve itself.

Meanwhile, consider using a private browser to link your bank with QuickBooks since everything is fine on their end. It can help you avoid issues related to your browser's cache, which may be corrupt. Use these keyboard shortcuts:

• Command + Shift + N (Safari)
• Ctrl+ Shift + N (Google Chrome)
• Ctrl + Shift + P (Mozilla Firefox) 

From there, reconnect your bank account. If successful, clear the main browser's cache to empty its history. Otherwise, utilize other supported browsers as alternatives.

Once your bank is successfully linked, the system will automatically download your transactions. You can then review and categorize them accordingly.

Moreover, save this material to manage transactions faster: Create rules to speed up reviews in QuickBooks Self-Employed.

We're always here to assist you further regarding bank connections or other related tasks for entries in QuickBooks Online. Just click the Reply button on this thread or create another post.