Hi, I also have mi10T lite.
The stable versions of Xiaomi eu for gauguin specifically (12.0.8.0 and 12.0.10.0), is not playstore certified, so generally saftynet will fail. and widevine L1 is not there. Thats the only version I tested, I don't know if previous versions has a fix for that. But right now, Im on latest weekly 21.2.3. And Playstore certification and Safetynet pass. Only widevine L1 isn't available.
Honestly, the someone said that the reason stable 12.0.10.0 isn't playstore certified is because its stable beta and recommended to flash the previous version. I did, flashed 12.0.8.0, but to no avail. same issue. He could've said the exact version specifically not just say "flash previous version" as its way too vague of an advice. But anyways, they have not all the resources means they do not own all the phone supported here, so they rely on User's feedback. So i kinda understand that.