I know the importance of keeping your accounts updated with your online banking transactions, @Mitaanshu. That's why I'm here to guide you with some steps to get this issue fixed.
Let me first provide some of the possible reasons you're unable to update bank transactions in QuickBooks Online (QBO):
When your bank is performing system maintenance, you can manually update your account. This refreshes the connection between your financial institution and the program. Let me guide you how.
I've attached a screenshot below that shows the first three steps.
Then, you'll have to sign in to your bank's website. This is to check your account page for messages or alerts that need your attention. When you make changes on the website (i.e. login credentials and account info), you'll have to update QuickBooks as well. Here's how:
I've attached a screenshot below that shows the first four steps.
Once downloaded, all you have to do is to review, categorise, and/or match them to the existing entries in QuickBooks. For the step-by-step guide, kindly refer to this article: Categorise and match online bank transactions in QuickBooks Online. It also contains instructions about excluding personal and duplicate transactions.
Additionally, I'd also recommend reconciling your account every month. This is to monitor your income, expenses, and effectively monitor the growth of your business. To learn more about this, you can refer to this article: Reconcile an account in QuickBooks Online. It includes information about editing completed reconciliations.
I want to make sure I've got everything covered. You can share with me any error message you've encountered while updating your bank transactions. This way, I can provide an exact solution.
Please let me know how it goes. You can always comment below if you have other concerns or follow-up banking inquiries in QBO. I'm just around to help. Take care always.