Glad to see you here in the Community, @brijesh-knoxed-c.
There are a few possible reasons why you're unable to connect to your bank:
Before we start, are you getting any error message when trying to connect your bank account? This is to ensure that we'll be able to give you the exact troubleshooting steps for this specific error.
In the meantime, you'll want to make sure that you've selected the correct bank's URL. You can also contact the bank to request and establish a connection with Intuit.
While waiting for the request, you can manually upload bank transactions from your CSV file. This is another way to bring transactions in QuickBooks. The first step in this process is to download your bank transactions and save it to your computer. Once done, you can now then upload them into QuickBooks. Here's how:
Once the transactions are added, you can check the articles below to learn more on how to keep them organized:
Don't hesitate to drop a comment below if you have other questions. I'm more than happy to help. Take care!