Microsoft published its minimum system requirements to run Windows 11 at the time of its release. As the TPM support is required to run Windows 11, many users have been refused to download and install Windows 11 in an official way. In recent days, those who are running Win 11 on the unsupported hardware will feel upset that Microsoft is testing to add a watermark to hint the users that your device doesn’t meet the minimum system requirements to run Windows 11.
It was firstly discovered by a user who tweeted the screenshot. In the picture, we could see that Microsoft has added the watermark to to right bottom the background wallpaper, telling that system requirements not met.

But till now, not all the users who didn’t download and install Win 11 via bypassing the TPM requirements will see that. But we’re not sure whether Microsoft will be expand this watermark to all of these users.
However, Microsoft does not make things worse to stop running Windows 11 on unsupported devices which don’t meet the minimum system requirements.