I appreciate you for letting us know about what you've tried on your end. I'm here to help you connect your bank account to QuickBooks Online.
Connecting the account in QuickBooks Banking will save you time categorizing transactions manually. Since we don't know the bank's name, can you share it with us?
This way, we'll be able to investigate the issue further and provide the necessary resolution. While waiting for the details, you can perform basic troubleshooting to isolate and fix the problem.
I suggest you start by logging in to your bank's website. Check if you can access your account without any problem or if there's ongoing maintenance.
Also, review any prompt that requires your attention or security settings to approve third-party apps to connect your account successfully.
The connection in QuickBooks depends on your bank website's status and account. After checking, attempt to reconnect the bank account in the Banking section.
Aside from linking your bank, you can also download your transactions and manually import them into QuickBooks Online. Here's an article you can check for additional reference on uploading your bank data: Manually upload transactions into QuickBooks Online.
Keep in touch with us if the problem persists with connecting your bank. We'll be patiently waiting for your response. Please take care.
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