Ah ah ah, je viens de demander à ChatGPT, naturellement je suis bloqué à l'étape 1.
If you've lost access to your device or the app that you use for the two-factor authentication (2FA) on your Microsoft account, there is a way to temporarily disable the 2FA and regain access to your account.
Here is the process you can follow:
Go to the Microsoft account security page.
Click on "More security options".
Scroll down to the section labeled "Two-step verification" and click on "Turn off two-step verification"
Sign in to your Microsoft account with your email and password.
You will be prompted to enter your verification code, but since you don't have the app or device, click on the link that says "I don't have my authenticator device"
You will be prompted to enter a backup code that you received via email or text message at the time you enabled 2FA.
Once you enter the backup code, you will be prompted to set up a new 2FA method.
It's important to note that disabling the two-factor authentication on your Microsoft account for a temporary time will make your account less secure, you should re-enable it as soon as possible and consider to use another authenticator app or get a new authenticator device, it's also important to save your backup codes in a secure place.
Also, if you are not able to access your email or phone number to receive your backup code, you may need to contact Microsoft support, they will be able to help you with the process and further verifications, to regain access to your account.