Hi, @Buck Tsai.

I appreciate you for sharing the screenshot of the error message you've received. I'm here to share with you the resolution to isolate this banking error.

Usually, error 103 occurs when credentials entered into QuickBooks Online don’t match with what your financial institution has. As an initial step, you can do the following:

• Make sure to input the correct credentials while trying to connect to your financial institution for the first time.
• Select the right financial institution (there are often many to select from).
• If you are currently connected and updated your credentials with your financial institution, you need to update the information in QuickBooks Online.

Here's how you can review your sign-in information:

1. Open a new window in your web browser and go directly to your bank’s website.
2. Make a note of the web address (such as https://www.bank.com). This may come in handy later.
3. Sign in with the user ID and password you have. If you have separate accounts with the bank (such as a business account and a personal account), sign in to the account you want to fix in QuickBooks.
4. If you sign in successfully, then you know the user ID and password are correct. If you get a sign-in error, follow your bank’s instructions to get your user ID, reset your password, or both.

Once done, you're now ready to sign in to your bank account in QuickBooks.

1. Click on Banking at the left pane, then select the bank or credit card account you need to update.
2. Hit Edit.
3. Select Edit sign-in info.
4. If your web browser auto-fills the user ID and password fields, clear them. This ensures your browser doesn’t put in old info by mistake.
5. Manually type in the user ID and password for your bank account. If your bank offers a Show option, select it so you can confirm you entered the password correctly.
6. Tap Update.

For additional troubleshooting steps, you can open these articles:

• What to do if you get a bank error or can't download transactions in QuickBooks Online
• Find your bank or credit card account when you connect to online banking

Moreover, you can open the topics from this link for more hints about bank feeds and reconciliation.

Please let me know if you encounter any other issues by leaving a comment below. I want to make sure everything is taken care of for you. Keep safe!