Does anyone have experience dealing with their older toddler/2 year old not listening to dad?

For the most part, DD listens to me. But she is sooooo much more difficult with DH and her tantrums are 10x worse with him. I have talks with her about listening to him, and that i don't like it when she yells at him. I always back him up, but that shouldn't be why she listens to him.

What do i do when she just freaks out on him and he can't calm her down? I can't keep swooping in, and i really think DH needs to come up with a better strategy when dealing with her. Has anyone experienced this? Any advice to share?