All Our Questions After Episode 1 of Disney+'s "Moon Knight"

In episode one, Harrow asks Steven to return a scarab to him. Steven, looking to get out of trouble, wants to do it, but the voice of Khonshu urges him not to, and his fingers literally won't unfurl to hand it over. Later, Harrow says the scarab belongs to Ammit, but doesn't explain what that means. It's not clear why the scarab is so important to what Harrow is planning, or how Marc/Steven got his hands on it to begin with.