Why am I not receiving my QuickBooks verification code?

https://quickbookhelpdesk.com/blog/common-quickbooks-sign-in-errors/

QuickBooks login issues are commonly caused by incorrect login credentials, internet connection problems, outdated software, browser issues, temporary software conflicts, or verification problems. Fortunately, most login problems can be resolved with simple troubleshooting. Checking your internet connection, verifying your account information, updating QuickBooks, clearing browser or application cache, restarting your device, and completing the verification process can restore access in many situations.