What am I missing? Third Person Controller

Hello, everyone. I just transfered to UE after 5 years of using Unity and there is quite the difference. I recently started working with a third person controller here in Unreal, and it works fine with the original manequin mesh, but when I retarget and then change to my own character, the movement is okay, but one of the functions - combat animations is not working. That is very weird for me because I have retargeted all the animation blueprint, blend space and aim offset 1D. I would be very thankful if you help me on this one and sorry if the question is too newbie. Thank you!