Now, player that has switched his view is getting another players camera location normally, but rotation is horizontal only. When player that owns the camera is looking down or up, player that switched sees straight and nothing changes for him.
You might want to try the Set Control Rotation node if your player’s camera has the “Use Pawn Control Rotation” field set to true. I’ve also had issues with Set View Target with Blend not updating rotation as expected, and had to manually correct the rotation of the camera using Set Control Rotation.
I also has the same issue. Resolved with rinbu’s advice, but I had to uncheck the “Use Pawn Control Rotation” from the spring arm, not the camera, as camera was the child of the spring arm.