RecruitingPhase 2Drug trialPre-transplant Purging and Post-transplant MRD-guided Maintenance Therapy With Elranatamab in Patients With High-risk Multiple MyelomaTo learn if giving elranatamab before and after an autologous stem cell transplant (ASTC) can help to control newly diagnosed, high-risk MM. An ASTC is a type of transplant in which a person's own stem cells are collected, preserved, and returned to them.