The primary objective is to demonstrate the superiority of IsaVRd or DRd induction followed by a single administration of AZD0120 compared to IsaVRd or DRd induction followed by continuous IsaRd or DRd in terms of progression-free survival (PFS) according to IMWG 2016 criteria, and as assessed by Blinded Independent Central Review (BICR) and miminal residual disease (MRD) negative complete response (CR) rate at 9 months post-randomisation in participants with NDMM who are ineligible to receive ASCT as initial therapy.