The Never-Ending Story is often found on subscription-based services such as Disney+. Additionally, some cable TV on-demand libraries might have it. You could also check out specialty streaming platforms dedicated to classic films.
You can try streaming it on popular platforms like Netflix or Amazon Prime Video. Sometimes, it might also be available on Hulu.
You might be able to stream The Never-Ending Story on HBO Max. Another option could be Paramount+. It's worth checking these platforms as their content libraries can change over time.