Unable to subscribe to Apple TV+ 6-month deal

Apple wrote:

Limited-time offer: Eligible subscribers get 6 months of Apple TV for AUD 7.99 per month. Offer ends 1/12. * Learn more

* Offer expires on 1 December 2025, 8pm PT. Offer for eligible new and qualified returning subscribers redeeming on eligible Apple devices or where a subscription to Apple TV is billed directly through Apple. A$15.99/mo after offer period. Apple TV subscription does not include third-party subscription services, MLS Season Pass or content available for rental or purchase in the Apple TV app. Offer not available if (i) you are eligible for a three-month-free Apple TV offer or (ii) your subscription to Apple TV is billed through a third party or your mobile wireless provider. Other new subscribers may receive a seven-day free trial. Plan automatically renews at your region’s monthly price after offer period until cancelled. Terms apply.

1. You will need an Apple Account with all the requested user information, a confirmation of the email address (respond to test message), and a valid payment method, that allows for automatic and periodical billing. Do you have that?
2. The offer is for new and qualified returning subscribers. Not current subscribers. Does that apply to you?
3. Try redeeming the offer in the Apple TV app on your Mac or PC, phone or tablet, rather than the website, while already being signed in to this app.
4. Review: If you can't redeem your promotion for an Apple subscription - Apple Support
5. Else contact the Apple Support staff for further assistance. Contact Apple for support and service (phone numbers) or start your support request online (chat/​email/​callback).