Why am I not receiving my QuickBooks verification code?

https://quickbookhelpdesk.com/blog/quickbooks-login-issues-on-mobile-devices/

QuickBooks login issues on mobile devices are commonly caused by incorrect login details, weak internet connections, outdated applications, temporary software conflicts, or verification problems. Fortunately, most of these issues can be resolved through simple troubleshooting. Checking your network connection, verifying your account information, updating the application, clearing temporary files, restarting your device, and reinstalling the application can solve many login problems.