There is an ongoing error code 185 for RBC. I have already tried the steps, but the error persists no matter how many times I correctly answer security questions

Try opening your QBO account on any private/incognito browser.

Hello credibleresults-. I'm here to assist and add to the valuable info 4Gal has provided above. I appreciate you double-checking the security questions as banking error 185 means your bank or financial institution (FI) requires more information after you enter your credentials. Here's a helpful article that shows you how to Fix bank error 185. In case you still have issues after checking out the article, I highly recommend contacting our support team for additional support. Here are our contact details: 

• Schedule a Callback or start a Chat: click (?) in the upper right in QuickBooks Online > enter "Contact support" > choose Contact Us > provide a brief summary > select Let's Talk > choose Get a callback or Start a Chat.
• Social Media: Facebook, Twitter, and Instagram.
• Support hours are from Monday to Friday between 9 a.m. and 8 p.m. ET.

Let me know if this info helps by leaving a comment below. I'll be on standby in case you need anything else. Otherwise, I wish you a great rest of the week!