Hi @Shreya G ,
If you have an alternative MFA method set up you can use that one. Otherwise if you are completely locked out and do not have any other MFA method, your options are to reach out to support or to the Azure Data Protection team to restore your access.
Azure Data Protection team number: (866) 807-5850)
Global support phone numbers: https://support.microsoft.com/en-us/topic/global-customer-service-phone-numbers-c0389ade-5640-e588-8b0e-28de8afeb3f2
Alternatively, you can create a ticket through your working tenant.