Hi, Did you had solutioned ?
I purchased a second hand MArvel R in France (and vehicule from France too), and I'm unable to get it working, similar to you, I created an MG Account on the app, when I scan the big QR code it is recognized on the app and ask me to confim clicking on "login" on the IOS app, when I click on login the QR code disapears (wich means it's more or less working), but still showing old informations (such as contact and telephone), and the vehicule doesn't shows in the app, meaning I can't control it.
Thank you