I have shared bedlamp with my spouse trough Mi Home app. She can control it except 1 thing: she cannot add/edit anything in Schedule view. Mi Home is saying "Shared device doesn't have persmission". I went trough all options of the bedlamp on my Mi Home account and did not found any sharing permissions settings.
Actually, there is permission control for different role.
Something like changing device name, scheduling, deleting device are only available for device owner.
But my spouse can for instance edit schedule of vacuum cleaner also shared with her. without any problem. She cannot only edit the bedlight schedule.