If I received verification code but i did not request,why?

I'd be glad to provide some information about the verification code you received, MOHAMMADIARASH.

We use multi-factor authentication across all of our products to protect your account and ensure that only you have access to your data. When you sign in to QuickBooks Online (QBO), you may be asked to enter a one-time confirmation code to complete the login process. As previously mentioned, someone might have used your email to access the company account if you didn't request one.

For more details about the multi-factor authentication process, click here to view the article. It explains in detail why you'll have to verify your identity when two-step verification is turned off.

This resource also includes information on how to keep your account secure: QuickBooks privacy and security. Please know that it's from another region, it also applies to the global version.
 

If you have additional questions about account management, tap the Reply button and leave your comment in the field box. I'll get back to assist you further. Have a great weekend and stay safe.