Have you set up multiple verification options, including a secondary phone number or an authenticator app on a different device, you can use one of these to sign in.
If not, please check whether this article is helpful: https://support.microsoft.com/en-us/account-billing/help-with-the-microsoft-account-recovery-form-b19c02d1-a782-dee6-93c3-dc8113b20c42
Any issues, I suggest you contact Microsoft for further assistance: https://support.microsoft.com/en-us/help/4051701/global-customer-service-phone-numbers
Thanks for your understanding.
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