I'm here to help import the .QBO file, AH6075.
This happens when something has changed in the file, such as the account number. And, QuickBooks isn't associating it with your bank account.
To fix this, you'll want to compare the account number from the downloaded file. Simply right-click it and select Open With in Notepad.
Now, look through the list and find the <ACCTID> for the account. On your Chart of Accounts in QuickBooks, right-click (control+click) on the account in question and choose Edit Account. Proceed to the General tab and copy the bank account number.
In the Notepad, after <ACCTID>, replacing what was there. And, re-import the web connect file to QuickBooks.
If the same issue persists, you can create a new bank account in the Chart of Accounts. Open the old one and rename it. Then, merge them so the lighting bold will be removed. All transactions will be transferred to the new online.
I've added these articles for other troubleshooting steps:
Let me know how everything goes by clicking the Reply button below. I'm always right here to help ensure you're able to import your bank transactions.