A Study to Evaluate the Safety and Pharmacokinetics of XMAB24306 in Combination With Daratumumab in Participants With Relapsed/Refractory Multiple Myeloma

Inclusion Criteria:

* Life expectancy of at least 12 weeks
* Measurable disease, as defined by the protocol
* Participants must have received a minimum of 3 prior lines of therapy, including at least one PI, one IMiD, and an anti-CD38 monoclonal antibody
* Best response of stable disease or better with at least one prior anti-CD38 monoclonal antibody containing line of treatment

Exclusion Criteria:

* Any anti-cancer therapy within 3 weeks prior to initiation of study treatment, with exceptions defined by the protocol
* Prior allogeneic stem cell or solid organ transplantation
* Autologous stem cell transplantation within 100 days prior to initiation of study treatment
* Significant cardiovascular disease
* Known clinically significant liver disease
* Active or history of autoimmune disease or immune deficiency
* Known active infection requiring IV anti-microbial therapy within 14 days prior to first study drug administration
* Primary or secondary plasma cell leukemia
* Current CNS involvement by MM
* Other protocol defined inclusion/exclusion criteria may apply