Unable to cancel app subscription

Odd, try closing down the App Store app entirely, and open it again. See if it then wants to load the subscription then.

click here ➜ Close an app on your iPhone or iPod touch - Apple Support

If it still has an issue, try restarting your iPhone and trying again.

click here ➜ Restart your iPhone - Apple Support

What does it say?

Yup its happening to me as well apple needs to fix this

was there a fix?

Nope its still saying the same thing.