Hi,
If you purchased your MBP in the last 90 days you are entitled 1 year of Apple TV +, this is not Apple TV which is a completely different product. If you are still within the 90 day window please click Apple TV+ - One Year Offer - Apple and scroll down to the area that tells you how to redeem the offer. If you want to know the difference between the Apple TV + and the Apple TV app, please click https://www.apple.com/tv/ and look at the top for links to each.
In the event you continue to have problems please contact AppleCare for support, you can get the number for your area by clicking AppleCare Contact Info