Welcome to the QuickBooks Community. I can see how essential to import entries into QuickBooks Desktop using IIF. Also, you've done all the possible steps to help fix your concern. With this, I'll ensure you'll be routed to the right support team to assist you further with this matter so you can get back on business.
I suggest contacting our QuickBooks Support Team, they have the tools to pull up your account which is needed in investigating the cause of the issue.
- Press F1 to open the Help window.
- From the search icon, type Contact Support.
- Click Contact us at the bottom part.
- Give a brief description of your issue about importing transactions and click the Search button.
- You'll be routed with How to connect with a QuickBooks expert and you choose which one is best for you.
Lastly, you may refer to this article to see various OL and OLSU Bank Feeds errors and how to fix them: Fix OL and OLSU Bank Feeds errors in QuickBooks Desktop.
Please know that you're always welcome to comment below if you have other concerns or follow-up inquiries about uploading transactions in QuickBooks. I'm just around to help and take care always.
