Hi @Younghoon Kim , please follow this guide to resolve your issue. If you still cannot resolve the issue, you can also try the following solutions mentioned in the retrieved documents:
- If you are a guest user, you can try to reset or change your password at your home tenant.
- If you are an administrator, you can try to reset the user's password or enable SSPR (Self-Service Password Reset).
- If you are an administrator, you can also try to dismiss the user risk after ensuring that the risk assessment was a false positive.
Please let me know if you have any questions and I can help you further.
If this answer helps you please mark "Accept Answer" so other users can reference it.
Thank you,
James