I think the problem is that you are trying to parent a rigid body to another object. I haven’t tried it very recently, but I’m pretty sure that rigid bodies can’t have parents and still behave properly because they are controlled by the physics engine and the parent breaks that. You would have to add a rigid body constraint if you wanted to tie the player object to the platform, but there isn’t a way to create constraints like that in nodes.
Another better possibility is to move your platform by using the Set Velocity node instead of the Translate node ( I’m assuming that is how you are doing it ). When using the Translate node, Armory moves the platform separate from the physics engine which means that the physics engine can’t evaluate its speed correctly to have you player rigid body move with it when it lands on it. A user had an issue on GitHub where movement wasn’t transferring from one object to another, and that fixed it. This would get rid of your volume trigger, too. You might need to increase the friction of the platform or the player if the player still slides off.