Hello Cyril Here are some potential solutions based on the information you have provided:
- Review the Legacy MFA and SSPR Policies: Before starting the migration, it’s recommended to do an audit of your existing policy settings for each authentication method that’s available for users. This includes documenting which methods are available in the legacy MFA policy and the legacy SSPR policy.
- Manage Security Defaults: Some users have reported that they were able to resolve similar issues by managing the security defaults in Azure Active Directory. You can try setting “Enable security defaults” to “No” in Azure Active Directory > Properties.
- Clear Browser Cache or Try a Different Browser: The issue might be browser-related. Encourage the affected users to clear their browser cache or try logging in using a different browser. Also try in Incognito mode, as mentioned by Carlos above.
- Check Conditional Access Policies: The issue might be related to Conditional Access Policies. Check if the “End user protection Check if the “End user protection” baseline is enabled” baseline is enabled.
- Enable Self-Service Password Reset (SSPR): Enabling SSPR and turning on Multi-Factor Authentication (MFA) might help resolve the issue.
The exact solution may vary depending on your organization's specific configuration and policies.