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Hi Sohaib,
Since the affected address is a work Microsoft 365 account and you cannot use Authenticator or any other verification method, changing the password alone will not normally get you past MFA.
You will need to contact the Microsoft 365 administrator for the sciteched.com organization and ask them to reset your authentication methods or require MFA re-registration. You can then sign in and set up Authenticator again.
If you are the only administrator and are completely locked out, you will need to contact Microsoft support for tenant/account recovery after verifying ownership of the organization.
Thank you, and feel free to respond back for more assistance.