The connection between QuickBooks and your financial institution will depend on the connectivity and configuration from your bank's website. If the connection is still unavailable and you already contacted support, you can manually upload transactions via WebConnect.
However, please know you can only download the data if your bank supports the specific file formats. To check the complete list and detailed instructions on how to upload them, visit this article:
Manually upload transactions into QuickBooks Online.
In case the connection gets back after uploading data manually, I recommend excluding added transactions through these steps:
On the left navigation, go to Banking.
Choose an account.
Click the For Review tab.
Put a check mark on the transactions you want to exclude.
From the Batch actions drop-down, choose Exclude Selected.
Check out this screenshot for your visual guidance:
Please know I'm always available here to help you succeed with connecting your account in QBO. Wishing you all the best.
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