Xiaomi Mi 10t Pro, Android 12, No Root , Global Turkey Version.
This problem was fixed by Google until 2 months ago. It would install the 67 MB November 1, 2023 security patch. I reset the device 4 times yesterday, but the security patch remains on September 1, 2022. It just won't upgrade to the current version. I uninstalled Play Store and tried it, same thing. I tried deleting all data, same thing. Do you think there is a new temporary problem on Google's side?
There is no issue with your phone, I'm afraid, and you will not get any more Security or MIUI updates from Xiaomi.
Your device is the same age as my current phone, a Poco F2 Pro, and a Mi 10 Lite 5G I just sold.
The Mi 10 Lite stopped receiving security patches sometime in late 2022 as well, I have screenshots of it somewhere, and this Poco F2 Pro (similar specs to yours but a different screen tech) had it's final security patch in February 2023 - which I stupidly have only just realised is only 2.5 years since launch and not three years as I had been thinking.
I had checked other Xiaomi forums and the dates for the final security patch on both my devices is fairly uniform for that era of device (2020).
Xiaomi have steadily lengthened their support promise on all three brands in recent times, but have been known to be late on OS updates and send Security patches every three months, though that may also improve.
My Poco received MIUI 14 on Android 12, and won't receive Android 13.
The Mi 10 Lite 5G only achieved MIUI 13 on Android 12, but there's very little visual difference. MIUI 14 runs very smoothly though, as it was a major overhaul of the "core experience".
Any questions, let us know.