It took me a while to revise what I was doing wrong. U have to make sure u spell mystructure:Red the right way. Make sure capitals a capital and lower case r lower case, that’s what got me
It only works in the end, but because of its NBT will lead to the same gateway. Getting the tile form in your hotbar is currently impossible in this version. You need to go to other versions or get and app that can override minecraft's limits to give you the block externally. But if your using it for design then your in luck because its just like bedrock in the overworld and nether.