The bone name must be the standard avatar name created in Vroidstudio for it to work.
The name to be referenced is as follows
J_Bip_C_Head
J_Bip_C_Neck
J_Bip_C_Chest
J_Bip_C_Hips
J_Bip_L_UpperLeg
J_Bip_L_LowerLeg
J_Bip_L_Foot
J_Bip_R_UpperLeg
J_Bip_R_LowerLeg
J_Bip_R_Foot
J_Bip_L_UpperArm
J_Bip_L_LowerArm
J_Bip_L_Hand
J_Bip_R_UpperArm
J_Bip_R_LowerArm
J_Bip_R_Hand