During the period January‒June 2024, JSI, as the Zero-Dose Learning Hub global learning partner, continued to provide technical assistance and collaborate and co-create with the Bangladesh Learning Hub. This semiannual update for the Gavi, the Vaccine Alliance Board (Gavi Board) and other stakeholders highlights the Bangladesh Learning Hub's efforts to leverage evidence for a deeper understanding of the factors that affect the implementation and performance of strategies to identify and reach ZD and under-immunized (UI) children and missed communities in Bangladesh. It synthesizes findings, challenges, and recommendations emerging across the IRMMA framework.