When I try and download bank transactions. Quickbook Block appears requiring PIN/Password. Whats is it?

Having the same problem and sometimes it goes thru and says I will get soon but they never download.

Hello, Sue928.  Appreciate you for joining here and letting me know that you've been experiencing this kind of behavior sometimes.

First, I'd like to confirm the product you're using. Is it QuickBooks Online or QuickBooks Desktop? Also, what's the name of your financial institution or bank, as well as the exact error message you've got? This would help me check my available resources here and be able to share with you the right amount of information.

Since the unusual behavior happen sometimes, probably, this is a browser-related issue. If you haven't tried the steps below, you can follow them if you're still facing that kind of odd behavior.

Step 1: Use an incognito window:

It's a way to check issues caused by a full cache.
 

Step 2: Delete cache and temporary internet files:

If it works, you can clear cache and temporary internet files to optimize the browser's performance. It will also help delete the information stored in the cache. Another way is to use compatible browsers with QuickBooks Online. 

You can refer to the articles below for additional information:

• Learn the reconcile workflow in QuickBooks. It includes steps to fix balance issues and ways to modify completed reconciliations.
• Categorize and match online bank transactions in QuickBooks Online. 

Just in case you're using QuickBooks Desktop (QBDT), you can try to run the Verify and Rebuild Data within your company file. This resolves common issues in QBDT.

Please let me know if these steps work for you. If you still need help with this matter or have any other concerns related to QuickBooks, please don't hesitate to tap me on my shoulder. I'd be glad to help you more. Take care and have a good one, Sue928.