A Study to Evaluate the Safety, Tolerability, Pharmacokinetics (PK), Pharmacodynamics (PD), and Preliminary Activity of Tiragolumab in Participants With Relapsed or Refractory Multiple Myeloma or With Relapsed or Refractory B-cell Non-Hodgkin Lymphoma

Inclusion Criteria: General Inclusion Criteria (All Participants): * Eastern Cooperative Oncology Group (ECOG) Performance Status of 0 or 1 * Life expectancy of \>/= 12 weeks Inclusion Criteria Specific to Arms A, C and E (R/R MM): * Arm A only: Must have R/R MM for which no established therapy for MM is appropriate and available or be intolerant to those established therapies * Arms C and E only: Participants with R/R MM who have received at least 3 prior lines of therapy. * Measurable disease defined by laboratory test results. Inclusion Criteria Specific to Arms B and D (R/R NHL): * Participants with histologically confirmed B-cell NHL who have relapsed or failed to respond to at least two prior systemic treatment regimens and for which no suitable therapy of curative intent or higher priority exists. * Must have at least one bi-dimensionally measurable lesion. Exclusion Criteria: General Exclusion Criteria (All Participants): * Any anti-cancer therapy, whether investigational or approved, including chemotherapy, monoclonal antibody, radioimmunoconjugate, antibody-drug conjugate, hormonal therapy, and/or radiotherapy, within 4 weeks or 5 half-lives of the drug, whichever is shorter, prior to initiation of study treatment * Prior treatment with any anti-TIGIT agent * Prior treatment with chimeric antigen receptor-T (CAR-T) therapy within 12 weeks before first study drug administration * Autologous Stem-Cell Transplantation (ASCT) within 100 days prior to first study drug administration * Active or history of autoimmune disease or immune deficiency * Known active bacterial, viral (including SARS-CoV-2), fungal, mycobacterial, parasitic, or other infection at study enrollment, or any major episode of infection within 4 weeks prior to first study drug administration Exclusion Criteria Specific to Arms A, C and E (R/R MM): * Primary or secondary plasma cell leukemia * Current or history of CNS involvement by MM Exclusion Criteria Specific to Arms B and D (R/R NHL): * Uncontrolled hypercalcemia or symptomatic hypercalcemia requiring continued use of bisphosphonate therapy or denosumab * Current or history of CNS lymphoma * Current eligibility for ASCT Other protocol defined inclusion/exclusion criteria could apply