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Thanks for reaching out to the Community, @chris198032-yaho.
May I know what specific bank you're having an issue within QuickBooks Self-Employed (QBSE)? Any additional information will help me provide the best resolution for your concern.
In the meantime, try signing into your QBSE using a private browse (incognito). This will help us check if this is a browser-related issue.
Once logged in, try to manually update your bank. Here's how:
If it works, return to your default browser and perform a clear cache to refresh the system. However, if the issue persists, try using other supported browsers.
Just in case, I also suggest checking out this article to learn more about the common banking errors and troubleshooting for QBSE: Common Online Banking Errors.
Please leave a comment below if you have any other issues or concerns, and I'll get back to you as quickly as possible. Take care and have a wonderful day!