Apple TV+ is trash and never works.
This app is F*cking trash. TV Shows are never “available to watch” I want my money back
Every user gets a free trial; to try it out, to see if it works for them. If you don’t want to continue the subscription, you can cancel it.
View, change, or cancel your subscriptions - Apple Support
Additionally, users can request a refund for content that they bought from Apple.
Request a refund for apps or content that you bought from Apple - Apple Support