Apple TV+ free one year subscription

Users have 3 months to redeem the offer. The offer would no longer be available after that time. Apple TV+ offer - Terms and conditions - Apple: “Offer must be claimed in the Apple TV app within 3 months after first setting up your new device.”

You would normally have received an extra reminder about a week before the last moment, unless you had opted out of email messages. Manage emails about Apple and Apple services - Apple Support

You can ask the staff for an exception, but they are not obligated to grant that to anyone that doesn’t qualify (anymore) per the terms and conditions.