how to spawn already tamed mobs?

thats not how spawning works

Create a procedure on your entity tick update:

And make sure that your entity is tamable:

you don't need to do entity tick update I think you just have to add a procedure on spawn that tames the mob with the owner being whatever you want, if you want it to be compatible with servers you could do something like using the closest player

I tried with the initial spawn procedure - doesn't work for some reason