Hi there, SHAL8. May I ask which bank you're using? Error 103 occurs when there is a mismatch between your bank's login requirements and the credentials stored in QuickBooks Online (QBO).
Start by logging into your bank's site in a private window to confirm your sign-in info is correct, if you can't log in there, you'll need to reset your username or password on their end first. While you're on their site, check for any third-party access settings to ensure you've granted permission for QBO to connect. Once you've verified everything on the bank's side, head back into QBO and manually type your credentials into the edit sign in info section to avoid any auto-fill errors.
For an in-depth guide, you can refer to this article: Fix bank error 103 in QuickBooks Online and QuickBooks Self-Employed.
If the issue persists after you've verified your login, reach out to our live support team during their available hours. They have the tools to investigate your issue further.
If you have additional questions, feel free to leave a comment on this thread.
