Hello @Tika Syahfitri,
As per our discussion over private message.
The user is unable to login due to incomplete of MFA and you are having global admin rights in the same tenant. Did you tried re-registering the affected user MFA methods?
If you have not done yet, please follow the below steps.
Please share these steps with your admin team to reset affected user MFA.
To manage user settings, complete the following steps:
1.Sign in to the Microsoft Entra admin center as at least an Authentication Administrator.
2.Browse to Identity > Users > All users.
3.Choose the user you wish to perform an action on and select Authentication methods. At the top of the window, then choose “Require re-register MFA” options for the user.
Then you can login back to any office application and register with new MFA auth method.
I hope this information is helpful. Please feel free to reach out if you have any further questions.