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Hi,Anonymous .Hello,GilbertQ ,

thanks for your concern about this issue.

Your answer is excellent!And I would like to share some additional solutions below.
I am glad to help you.
Has your problem been resolved? If not, please read my reply below.

Unfortunately, Microsoft has been gradually implementing MFA to enhance the security of its services, including Power BI. This enforcement may be the reason why you are suddenly seeing MFA prompts.
Here are some suggestions that I think might be helpful to you.
1. You can try to log in by other means, such as binding your phone number and logging in by SMS authentication.

2.Recovery Options: Visit the web :https://account.live.com/ResetPassword.aspx, to see if you can reset or recover your account access.

to see if you can reset or recover your account access. This page can help in situations where you're locked out of your account.

Please be cautious about trying this approach, you may want to consult with your organization's IT department if your account is relevant to your organization. If your account is related to the organization, you can consult with the organization's IT department to see if recovery can be used to resolve your issue.
3.Review the relevant Microsoft Entra Authentication documentation.

We hope you find the following documentation helpful.
 Microsoft Entra authentication overview - Microsoft Entra ID | Microsoft Learn
Deployment considerations for Microsoft Entra multifactor authentication - Microsoft Entra ID | Microsoft Learn
4. In the event that none of the above attempts work, I recommend that you do as you have described: seek assistance by calling Microsoft's official phone number; in fact, Microsoft's authentication requirements are constantly being improved to better protect users' private information.