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If you don’t have access to your phone number, you can get the Microsoft verification code sent to your alternate email. When setting up your account, you may have provided a secondary email address for such situations. During the verification process, select the option to send the code to your alternate email. Simply check your inbox, retrieve the code, and enter it on the verification page to continue

Visit here for more details: https://community.wd.com/t/how-to-get-microsoft-verification-code-without-phone-number/295899

How to Verify Your Microsoft Account Without Your Phone
Verifying your Microsoft account without your phone is possible through several alternative methods. This is especially useful if you’ve lost access to your phone, changed your number, or simply prefer not to use your phone for verification. Here are several ways to [verify your Microsoft account without using your phone](https://community.wd.com/t/how-can-i-verify-my-microsoft-account-without-my-phone/295715: