Log in your M365 account.
Step 2. Use password
Step 3. Click on Next.
Step 1. Login to https://entra.microsoft.com/ using global administrator credentials.
- Click on the Protection blade on the left pane and then select "Authentication methods".
- Click on the registration campaign and Edit button on the top.
- Now under state you can click on the drop-down option, and you will see options to disable registration campaign.
For More Details go to the Microsoft article: -
How to run a registration campaign to set up Microsoft Authenticator - Microsoft Authenticator
https://learn.microsoft.com/en-us/entra/identity/authentication/how-to-mfa-registration-campaign
What authentication and verification methods are available in Microsoft Entra ID?
https://learn.microsoft.com/en-us/entra/identity/authentication/concept-authentication-methods#authentication-method-strength-and-security