Hi there mryamm11,
Thanks for posting in Apple Support Communities!
To best answer questions about subscriptions within third-party apps, such as YouTube, you'll want to reach out to app developer.
Check out how to do so below:
Contact the developer of an iOS, iPadOS, or watchOS app
1. Open the App Store on your iPhone, iPad, or iPod touch.
2. Search for the app, then tap it. If you can't find it, tap the account button
or your photo at the top of the screen, tap Purchased, tap "Not on this [device]," then tap the app.
3. The app's product page appears. Scroll to the Ratings & Reviews section, then tap App Support. If you don't see App Support, make sure that you're signed in with the correct Apple ID.
This information can be found in How to contact an app developer.
Cheers!