Hi leonieyoung06,

Thanks for posting in the Community! May I please know the name of the bank where you're getting an error 103? Error 103 usually means that the user ID or password is incorrect for the bank account you’re trying to connect.

First thing we'll need to do is to login on your bank's website to confirm your sign-in info is correct. Here's how: 

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. Note: 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 you’re sure about your user ID and password, login to your QuickBooks Online and enter your bank sign-in info. Here's how: 

1. On Transactions tab, select Banking. 
2. Select the pencil icon on the blue bank tile where you have an error 103.
3. Select Edit sign-in info. 
4. Enter manually your user ID and password.
5. Select Update. 

In any case you encounter the same error 103 when connecting your bank, I would recommend contacting our customer support team to further investigate your bank connection. 

For your reference, you can also check on this article: What to do if you get a bank error or can't download transactions in QuickBooks Online. 

Let me know if you need further assistance with bank error 103. I'm here to help.