I entered USA via L2 visa. A research institute would like to employ me and filed application for change of status from L2 to H1B. I received approval email of H1B on Jun 23 (but I have not received the I797 approval notice). The research instate rescind my offer on Jul 2, just before my orientation on Jul 6.
My question is: Has my H1B status been started? If yes, what should I do? Do I need to change H1B back to L2 immediately?