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Welcome back to the Community, @srudesal.
Error 105 usually fix themselves within 24 hours. Since the 2nd account went through smoothly, you can manually click the Update button for the 1st account to get past this error.
Just go to your Banking page and click the Update tab.
If you still can't connect, you may need to wait 2 or 3 hours and try again. Additionally, you can sign in to your bank's website to verify if there are any issues with your bank that's affecting the download process. You can check this article and scroll down to Step 2: What to do if bank transactions won’t download or there's a bank error.
However, if the error persists after 72 hours, please contact our QuickBooks Online Support so they can further investigate the issue.
Let me include this helpful article in case you'll need to manually import your bank transactions: Manually upload transactions into QuickBooks Online.
Leave a comment below if you need anything else. I'm always here to help. Have a nice day!