I accidentally canceled Apple TV free subscription. I have 6 more months free. Can I undo the cancellation?

In order to cancel one must go into their account, select the subscription, choose to cancel and then confirm the cancelation. Users are notified that cancelling the subscription will also stop the trial and cannot be reactivated. As above, you are free to contact Apple support to see about an exception, but it is within their discretion and most are not.

Click here and ask the iTunes Store staff if they'll grant you another. They aren't obligated to.

People can't resume cancelled trials themselves.

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Is your subscription continuing until the 6 months is up? You can choose to resubscribe.