Hello. I have resolved the problem all by myself after few hectic hours of uncertainty and dismal.
To begin with, I got my brand new MG ZS EV long range, Luxury ( Trophy connect in the UK) yesterday, but failed to even download the application MG iSMART as the Google store states it is not available in my country ( France)...?!?!
Then the dealership TD me I have to change my mobile with a compatible one...!!??!?
My phone runs on Android 12.5.10 and being a super cool Xiaomi Mi10T Pro 5G, 256 GB and had no intention to do so only to have the application running.
So few hours later I have found this link

MG iSMART 1.1.4 APK
Download MG iSMART 1.1.4 APK for Android - com.saicmotor.iov.europe. Created by SAIC MOTOR INTERNATIONAL CO., LTD. in Entertainment
 apksos.com
downloaded the app file, had it installed and instantly my life turned back normal.
It takes few attempts, indeed to set all the password, the account, the secret 4 digit code, but it is all self-explanatory, easy and quick to do. I found it much easier to be inside the car, while setting all up. Can't tell.wether it was the cable connection or what, but now I have an active, perfectly operational app and can really profit from the MG iSMART advantages.
Good luck to you all.