Transfer from Desktop to Online causes errors in bank accounts

I can share some information about what happens to your bank connection when you convert from QuickBooks Desktop (QBDT) to QuickBooks Online (QBO), @Bunkerup.

When you convert from QBDT to QBO, your bank and credit card accounts set up for Bank Feeds in QuickBooks Desktop will lose their connections and bank rules don’t convert.

Check the following article for more information on how your books convert from QBDT to QBO including your online banking: What to expect when you switch from QuickBooks Desktop to QuickBooks Online.

To resolve this or remove those duplicate entries, I suggest excluding all the duplicate transactions from the For Review tab. Here's how:

1. Go to the Banking from the left menu and select the appropriate bank account.
2. Click the For Review tab, then put a checkmark to the duplicate transactions.
3. Select Exclude.

For detailed guidance on how to exclude duplicate transactions on the web or in the mobile app, refer to this article: Exclude a bank transaction you downloaded into QuickBooks Online. 

Once you're all set, you can now continue categorizing and matching your bank transactions. For more information, feel free to check out this article: Categorize and match online bank transactions in QuickBooks Online.

Should you need any additional assistance while managing your bank transactions, you can leave a reply below. I'll be sure to get back to you. Stay safe!