Organisations who don't give architecture work to juniors are terrible places to work for juniors. Zero career progression. You can only really learn good architecture through practicing and making a lot of bad design decisions.
I did architecture work when I was a junior. It's what made me a senior. I got asked if I wanted to do architecture work recently. I told them that's what we hire juniors for.
Architecture is piss easy. Any senior thinking juniors can't do it are full of themselves.