https://phys.org/news/2021-04-comprehensive-emdrive.html
In a comprehensive new test, the EmDrive fails to generate any thrust:
The EmDrive is a hypothetical rocket that proponents claim can generate thrust with no exhaust. This would violate all known physics. In 2016, a team at NASA's Eagleworks lab claimed to measure thrust from an EmDrive device, the news of which caused quite a stir. The latest attempt to replicate the shocking results has resulted in a simple answer: The Eaglewor