RecruitingPhase 4Drug trialAn Exploratory Study of Cluster of Differentiation 38 (CD38) Monoclonal Antibody Combined Corticosteroid in Acquired Hemophilia ATo evaluate the time of response, sustained remission rate and relapse rate of CD38 monoclonal antibody (Daratumumab) combined corticosteroid in the treatment of AHA. To evaluate the safety of CD38 monoclonal antibody in the treatment of AHA.