Nothing appears in inventory when I click on the crate key in the /rewards selector box.
How do I claim the 3 keys or is it a bug?
The keys are not physical objects so they don't appear in your inventory, they just allow you to redeem a mystic crate. You claim the mystic crate at /crates in /spawn. Hope this helps!
I didn't realize you click on the crates since I thought they were decorative heads xD
Thank you, your post helped a lot!