A Microsoft app for iOS and Android devices that enables authentication with two-factor verification, phone sign-in, and code generation
Thanks for your question.
You need to backup your credentials in authenticator, if ths was not done unfortunately you can only resolve this by contacting support or asking your admins/support to reset your account https://learn.microsoft.com/en-us/xandr/curate/troubleshooting-multi-factor-authentication-mfa?source=recommendations
You can reach the support team via the global support numbers here:
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Regards,
Abiola