got the solution for it… i was tripping and searching for hours but finally got the answer…
after placing the foliage assets in foliage tool, select all of them and then scroll down the settings of them in the foliage tool and just make sure you are under the placement values…, if not then tweak them according to your need and you will be able to place foliage. I had a outer space scene and my placement was waay less acording to my planet, so had to increase it by a ton…