They may have updated their secure connection on the day it was disconnected.
That said, I recommend manually updating the connection.
Let me show you how:
Go to Transactions/Banking.
If the error persists after 72 hours, please contact our QuickBooks Online Support. They have tools to check your account and verify the connection from your financial institution to QuickBooks Online.
Just in case if you're going to update your Online Banking credentials, make sure to edit also the sign-in credentials in QuickBooks. It may cause any connection issues between your bank and QuickBooks.
Go to Transactions/Banking
Choose the blue tile and then click the Pencil icon.
Select Edit sign-in info.
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For now, you'll want to manually download transactions from your bank. Then, import them to QuickBooks. Let me show you how:
In QuickBooks Online, go to the Banking menu.
Select the blue tile for the account you want to upload the transactions into.
Hit the Update▼ and then File upload.
Click Browse and select the file you downloaded from your bank, then click Next.
From the QuickBooksaccount▼ drop-down menu, select the account you want to upload the transactions into, then click Next.
Match the columns on the file with the banking fields in QuickBooks, then select Next.
When you’re ready, select Let'sgo.
After that, you can match, categorize, and add those entries to your register. This is to ensure you won't miss any entry from your bank statement.