Apple TV Search cant find any shows from streaming apps i've subscribed to

Recently bought the latest 4K Apple TV and when i press the search button on the side of the remote (Siri) it cant find any shows , sometimes it will display what i can rent etc.... even though ive subscribed to Apple TV, Netflix, Stan, Prime etc... i thought it would search for a movie or tv titles across my different streaming apps. i upgraded from a google chromecast with TV that was able to do this? am i doing something wrong ? its annoying as i have to go into each subscription until i can find what im after