I am missing 6 months of transaction that should be linked
Let's get your six months missing transactions back in QuickBooks, @keithcampbell-sc.
I want to ensure your missing transactions will get back in your QuickBooks Online account without a moment's delay. Thus, you can categorize and reconcile your account.
If your bank is new in our online banking feature, note that some banks let you download the last 90 days of transactions (count start in the first connection). Others can go back as far as 24 months. Check this out for more information: Connect bank and credit card accounts to QBO.
If it's not new, I'd recommend manually updating the connection. To do this, follow the steps below:
Go to the Banking tab on the upper left pane.
Click the Update button.
Repeat the steps until you'll see the missing transactions.
Lastly, may I know what is your bank's name? This way, I can check our reports to see if there are problems reported. Doing this will help me provide the most appropriate troubleshooting steps to help resolve the issue.
Drop a line if you have follow-up questions about your bank feeds. I'm happy to answer all of your questions. Keep safe, keithcampbell-sc.