How do i fix the inability to send and recieve multi-media messages between apple and android

[AC Question]

My Galaxy S6 Edge+ cannot receive mm messages from my friend who is an iPhone user. He can not receive them either, and he is the only apple user that this issue applies to. We can not send each other pictures, and if i am in a group chat that he is in, it will block him from receiving the messages from that gc. We are both Verizon users

Any suggestions on how to fix this?