Try to change your region in system settings (you might even receive an OTA update), updates are sometimes blocked for whatever reason for a particular country. India/China are usually first to receive an update, so they might work.
MIUI sub-version numbers are reset after major Android upgrade, so V12.0.1.0.
RJSEUXM (MIUI12 Android 11) is newer than V12.0.8.0.
QJSEUXM (MIUI 12 Android 10).
Btw. it seems that there was one more ROM update before moving to Android R (
V12.0.9.0.QJSEUXM), you could have more luck with its installation.
List of all ROMs (sort by date and look for EU ROMs):
https://xiaomifirmwareupdater.com/archive/miui/gauguin/
Thank you for the reply, i have succesfully downloaded and installed the 12.0.9.0 firmware version on her phone.
So now it says :
MIUI Global 12.0.9.0 (QJSEUXM)
The android security level is now 01-01-2021
I then tried changing region to a lot of different countries, including countries in the African region, and India which i believe is in the asian region, and also a few european, it said "Changing region" multiple times, but no matter what country i tried, it still said "No available updates". This was offcourse with 12.0.9.0.
I feel that the speed with which it says "There is no update" kind of suggests that it might not even check, but i dont know if it does, and just really quickly figures out that there is no updates.
So while she got a marginally newer firmware with a 1 month newer security date, it still refuses to find OTA updates with 12.0.9.0 Android 10 by itself.
I also tried re-running the downloaded 12.0.1.0 Android 11 version i had previously downloaded, but it still fails with the same message as before.
It seems the update routine for this phone is really screwed. It was able to do the manual update to the newer android 10 but it refuses to do anything with the android 11 firmwares.
If anyone has more succes, i would like to hear about it. My teenage daughter is not prepared to do a full factory reset, so unless someone finds a way to do this without having to reset the phone, i think she will just want to keep the phone on the current firmware.
PS. I also tried disconnecting from our wifi, in case our firewall was blocking, but on 5G it still does not find any updates, really fast.