I've got your back, @hhbookkeeper.
May I know the specific bank you're having problems with? That information can help me find you a timely solution. Also, I suggest reaching out to your bank to check if they having any maintenance updates. In the meantime, let's perform some troubleshooting steps to isolate the error you've received. Here's how:
To start, let's confirm that your bank's sign-in info is correct.
Open a new window in your web browser and go directly to your bank’s website.
Sign in with the user ID and password you have.
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 confirmed, sign in to your bank account in QuickBooks:
- Select Banking/Transactions tab.
- Click the bank or credit card account you need to update.
- Hit Edit.
- Tap Edit sign-in info.
- 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.
- 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.
- Hit Update.
For more info about the process, see this article: Fix bank error 103.
Then, once transactions are already in, I've got you this helpful guide to categorize and match them in QuickBooks.
Feel free to get back here if you have further concerns about connecting your bank to QBO. I'll be around to help you in any way I can. Have a good one.