Reports out of China have stated that Xiaomi has started blocking the installation of Google Mobile Services (GMS) from some of its smartphones that operate with the China ROM firmware. Previously, users in China had been able to install the Google apps, but some with devices running on MIUI 12.5 have found this is no longer possible.
https://www.notebookcheck.net/Xiaomi-uses-MIUI-12-5-update-to-start-blocking-Google-Mobile-Services-installation-on-China-ROM-smartphones.517804.0.html