Can't spawn Reaper or get my base defense to work

Hey I’m just trying to get my base defense to work it keeps on saying I need to provoke butts in region and I have and also trying to spawn the reaper which I had eight Rivals killed the lowest one and it just took away arrival without replacing it I ran across this problem with a guy I was playing with last night on his game to Xbox 1 X

You arent guaranteed to spawn a reaper when the region has reached level 21 or above, you still need to kill non rivals to get it to spawn and after every finished combat its random if it spawns or not instead of a rival, exactly like rivals. Base defence appears to be broken on all platforms tho, at least for the majority like base assault.