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Let me help you with connecting your AMEX account, Twille.
It looks like we have to disconnect and reconnect the account to apply the new changes and resolve your concern.
First, here's how to disconnect the account:
Click Save and Close.
Then, connect the bank account.
Once done, transactions will be downloaded automatically. Then, you can categorize and match online bank transactions in QuickBooks Online.
You can get back to this thread if you need more of our help. We're just right here for you. Take care!