you are using version 12.1.4 plus google still does not work ??? in my case for example when I enter uber it appears that the version of Google play services is not compatible with this phone. does it not pay to install xiaomi.eu 12.1.4 rom which will stay the same way correct?
I switched to .EU at 12.1.3 and updated to 12.1.4.EU and Google play service work great (the .EU ROM has them embedded within, even when you set up the phone.) I use both the Google play account and the Mi account.
I just installed UBER and it opened but I didn't set it up and then uninstalled it.
Should be fine!
Good luck!