I got two bank account ,how come Banking module only show 1 bank account for connection?

It's nice to see you here in the Community, @finance168.

I have some information to share about connecting a bank account in QuickBooks Online.

In QuickBooks Online you have the option to add a sub-account. It means that you can connect a parent account to the online banking and associate the sub-account, so the transactions will flow. In this set up, you can only see one account (parent) from the banking page.

To add a sub-account:

1. Go to the Gear icon and select Chart of Accounts.
2. Select New. Select the account type and detail type. You can learn more about detail types if you have questions.
3. Select Is sub-account and then enter the parent account.
4. Give your new subaccount a name. You can also add a description.
5. For the as of date, tell QuickBooks when you want your account to start. Then add the Balance in the account as of the date you choose. Note: Only some account types need this, like bank, credit card, asset, and liability. If you need help, you can learn more about opening balances.
6. Select Save and Close.

For more details about this process, please see this link: Learn how to create subaccounts to keep your chart of accounts organised.

If you want to connect both accounts to the online banking, you'll need to add the other account to the chart of accounts and connect it afterward.

Here's how to create a new account:

1. Go to the Gear icon and select Create a new account. 
2. Click the New button. 
3. The Account window opens.
4. For the Detail Type drop-down menu, select Bank.
5. Assign a name and all other information.
6. Specify whether this is a sub-account of another account.
7. Provide the Opening Balance of the account.
8. Click Save and close.

From the chart of account, here’s how to add your bank:

1. Go back to your Chart of Accounts.
2. Select the new account that you’ve created a while ago.
3. From the View register (or Account history) drop-down, select Connect bank.
4. Follow the prompts to connect your bank account.

I'd recommend checking out this article to learn more about connecting your bank accounts in QBO: About bank or credit card subaccount setup.

For now, you may consider manually uploading your bank transactions in the system to get your work done.

Let me know if you're referring to something else or you need more help with banking. I'll be right here for you. Have a lovely day!