You can manage (add / remove) your authentication devices here.
https://mysignins.microsoft.com/security-info
--please don't forget to upvote
and Accept as answer
if the reply is helpful--
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I have enabled two-factor authentication on my account, but I cannot sign in because I do not have the certificate that is required. I have tried to reset my password and use the backup codes, but they did not work. Can you please help me to access my account again? What steps do I need to take to get the certificate or disable the two-factor authentication?
Thank you for your assistance.
You can manage (add / remove) your authentication devices here.
https://mysignins.microsoft.com/security-info
--please don't forget to upvote
and Accept as answer
if the reply is helpful--