Inclusion Criteria:

• • Documented initial diagnosis of multiple myeloma according to International Myeloma Working Group (IMWG) diagnostic criteria based on documented medical history
• • Participant could not tolerate or has disease that is relapsed or refractory to established therapies, including the last line of therapy (except as noted in point 'a' and 'b'). (a) For cohorts without daratumumab, prior lines of therapy must include a proteasome inhibitor (PI) (example, bortezomib, carfilzomib, ixazomib), an immunomodulatory drug (IMiD) (example, thalidomide, lenalidomide, pomalidomide), and an anti-CD38 therapy (example, daratumumab, isatuximab) in any order. (b) For cohorts with daratumumab, prior lines of therapy must include a PI (example, bortezomib, carfilzomib, ixazomib) and an IMiD (example, thalidomide, lenalidomide, pomalidomide). Treatment with an anti-CD38 therapy (example, daratumumab) is allowed greater than equal to (>=) 90 days prior to study treatment if the participant did not discontinue prior treatment due to adverse events related to anti-CD38 therapy
• • Eastern Cooperative Oncology Group (ECOG) performance status grade of 0 or 1 at screening and immediately before the start of study drug administration
• • Women of childbearing potential must have a negative highly-sensitive serum beta-human chorionic gonadotropin (beta-hCG) pregnancy test (less than [<] 5 international units per milliliter [IU/mL]) at screening and a negative urine or serum pregnancy test within 24 hours prior to the first step-up dose and the first dose of each treatment cycle
• • Men must agree not to donate sperm for reproduction during the study and for a minimum 100 days after receiving the last dose of study treatment

Exclusion Criteria:

• • Prior anticancer therapy as follows: a) targeted therapy, epigenetic therapy, or treatment with an investigational treatment or an invasive investigational medical device within 21 days or at least 5 half-lives, whichever is less; b) monoclonal antibody treatment for multiple myeloma within 21 days; c) cytotoxic therapy within 21 days; d) proteasome inhibitor (PI) therapy within 14 days; e) immunomodulatory drug (IMiD) therapy within 7 days; f) radiotherapy within 21 days. However, if the radiation portal covered less than or equal to (<=) of the bone marrow reserve, the participant is eligible irrespective of the end date of radiotherapy; g) gene modified adoptive cell therapy (example, chimeric antigen receptor modified T cells, natural killer [NK] cells) within 3 months
• • A cumulative dose of corticosteroids equivalent to more than or equal to (>=) 140 milligram (mg) of prednisone within 14 days
• • Live, attenuated vaccine within 4 weeks prior to first dose of study drug unless approved by sponsor
• • Active hepatitis C infection as measured by positive hepatitis C virus (HCV)-RNA testing. Participants with a history of HCV antibody positivity must undergo HCV RNA testing
• • Known allergies, hypersensitivity, or intolerance to daratumumab, talquetamab, teclistamab, or their excipients