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Glad to have you here in the Community, @laura-wagner. I can help sync your AMEX transaction in QuickBooks Online (QBO).
Since your financial institution changed its website, you'll have to update your bank sign-in information in QBO. This way, it'll reflect the changes.
To do so, please follow the detailed steps below:
Once done, your credentials are updated and connected to your bank's website.
I'm adding this article for more information: How to update your bank account sign-in information.
Just in case you have missing transactions downloaded from your AMEX Bluebird account, feel free to check out this article for more guidance: What to do if you can’t find downloaded transactions in QuickBooks Online.
If you need any additional assistance while managing your bank transactions, you can leave a comment below. I'll be sure to get back to you.
I'm back to ensure everything is up and running, @laura-wagner.
Did your AMEX Bluebird transaction download after updating your bank manually? I can provide further assistance if you encounter any issues with this.I'll be more than happy to assist you again. Happy Thanksgiving!