In case you still need an answer: Orthographic cameras can’t capture shadows (as far as I know) but you CAN set up a second camera that captures the shadows, then stream that texture to a quad that the orthographic camera CAN see.
In case you still need an answer: Orthographic cameras can’t capture shadows (as far as I know) but you CAN set up a second camera that captures the shadows, then stream that texture to a quad that the orthographic camera CAN see.