QuickBooks ensures the security of your account by providing advanced security tools and systems. Since you've asked for a verification code, you'll have to set up an authenticator app. Let me guide you how.
Download an authenticator app from the iOS App store or Google Play by searching for “authenticator”.
Sign in to your Intuit Account, then select Sign in & security.
Click Authenticator and choose Set up authenticator app.
Follow the on-screen instructions to complete the setup.
Once done, you can now continue setting up your QuickBooks account and use the authenticator app to get a verification code.