There's a thread about that in Bugs section, Igor asked to send logcat while trying to open eSIM menu. Do it if you can, then it may be fixed in next update.
It shouldn't matter. Page on Community checks age of Xiaomi Account (not Community account), so it wouldn't allow to apply for unlocking permissions, if the account exists for less than 30 days...
Flash modem and modemfirmware images from Global ROM. Unpack this package, boot phone to Fastboot mode and run script.
https://miuipolska.pl/d/xiaomi.eu/modem/houji_global.zip