Inclusion Criteria: - Age ≥ 18 years - Participant has a diagnosis of multiple myeloma (MM) with relapsed and/or refractory disease Participants must have documented progressive disease on or within 12 months of completing treatment with the last anti-myeloma treatment regimen, except for participants with cellular therapy (eg, Chimeric antigen receptor (CAR) T-cell therapy) as their last treatment, who may enroll beyond 12 months - Participants must have received at least 3 prior anti-myeloma treatment regimens (note: induction with or without hematopoietic stem cell transplant (HSCT) and with or without maintenance therapy is considered one regimen), including: - Autologous stem cell transplant - A regimen that included an immunomodulatory agent (eg, thalidomide, lenalidomide, pomalidomide) and a proteasome inhibitor (eg, bortezomib, carfilzomib, ixazomib), either alone or combination - Anti-CD38 (eg, daratumumab), either alone or combination - Measurable disease - Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1 - Adequate organ function Exclusion Criteria: - Known active or history of central nervous system (CNS) involvement of MM - Active or history of plasma cell leukemia, Waldenstrom's macroglobulinemia, POEMS (polyneuropathy, organomegaly, endocrinopathy, monoclonal protein, skin changes) syndrome, or clinically significant amyloidosis - Active autoimmune disease requiring immunosuppressive therapy - History or presence of clinically significant CNS pathology such as seizure disorder, aphasia, stroke, severe brain injuries, dementia, Parkinson's disease, cerebellar disease, organic brain syndrome, or psychosis Other protocol-defined inclusion/exclusion criteria apply