Hello Hu, Hao,
It is a recent outage, and the issue is faced by everyone in community, and I am able to reproduce. Microsoft is working on the issue.
I would recommend you raise a support case with Microsoft Graph, a Support Engineer will be able to look into this issue and assist you better. You can raise support ticket from New support request - Microsoft Entra admin center or https://admin.microsoft.com/#/support/requests.
Hope this helps.
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