Your task is not to get permission from the community, but to link your device to your account. I want to say that even if you are rejected by the community, go to the developer menu (mi unlock status) and click Link device. It worked (from first click) for me from a box from the store. I didn't even go to the community that day. well, then the usual scheme: miunlock -> 72 hours of waiting, again miunlock - DONE