Hi, Xueyuan He
Thank you for using Microsoft products and publishing them in the community.
I understand that there is currently a problem with Microsoft Defender for Endpoint.
Unfortunately, the issues with Microsoft Defender for Endpoint go beyond the support of the Microsoft community.
There's a section of Microsoft Tech community dedicated to this issue designed to support Microsoft Defender for Endpoint users like you.
Link to the forum:
Microsoft Defender for Endpoint - Microsoft Community Hub (available in English only), where you can ask for details and share troubleshooting ideas.
Finally, even though I can no longer help you, I hope the information I have provided has helped you find your way.
Best regards
Aiden.C - MSFT |Microsoft Community Support Specialist