Do you need to cancel iCloud storage?
Did a family member sign up for the subscription?
You can’t cancel a family member's subscription. Ask your family member to use their own device to cancel the subscription. Or if you share a device, ask that family member to sign in with their Apple ID and cancel the subscription.
If you want children to get permission before they buy a subscription, turn on Ask to Buy.
Is the subscription billed through another company?
On your bank statement, find the charge for the subscription. If it does not say iTunes, Apple or something similar, the subscription may not be billed through Apple.
Did you subscribe with a different Apple ID?
To see subscriptions for a different Apple ID, sign in with that Apple ID and then try to cancel again.
Do you need to cancel an AppleCare plan?
Contact Apple Support
If you still can't find the subscription and cancel it, contact Apple Support.