Hello Bukhori Saning,Good morning!Thank you for publishing in Microsoft Community. We are happy to help you.Based on the description you have shared; and since we have power BI support team it is important to understand clearly your issue
However, to better understand the problem and find out which team can handle the issue to provide the correct solution, we need more details from you, please provide us with the following information. Thank you.
1-Please do you mean you can't access your @domainonmicrosoft.com account due to Authenticator app. Am i correct?
If it is Authenticator issue, please can you check if you can use another authentication method after entering your email address and password. Kindly share a screenshot after entering your email address and password what you got.
2-Please can you try the below steps:
Go to the Microsoft 365 sign-in page (https://www.office.com/).
Enter your @onmicrosoft.com email address and click "Next".
On the next page, click "Sign in with another account".
Enter your personal email address and password associated with your @onmicrosoft.com account.
You should now be able to access your @onmicrosoft.com account.
3-Please note also that for any issue regarding Power BI we have our dedicated team, you can contact them via Microsoft Power BI Community - Microsoft Fabric Community
We look forward to your reply. This requested information will help us narrow down the scenario and find the right troubleshooting. We will continue to assist you based on the information you provide. I sincerely appreciate your patience and cooperation.SincerelyEben Ezer Tres | Microsoft Community Moderator