Good Afternoon, @JungoBoss.
Thanks for joining in on this thread. Since you're still having trouble connecting your Bank of Southern California account to QuickBooks Online, I recommend contacting our Customer Support Team. They have additional tools to look further into your account to see why this error is occurring. Here's how to get in touch with them:
If you run into any trouble along the way, just let me know. I'm only a post away. Bye for now!