I’m unable to activate my free 1 year Apple TV received with new iPad purchase

See the section "Redeem your free year of Apple TV+ now" in this support page:--> https://offers.appletvapp.apple/tvp11191yf

If you still get no help, contact Apple Support using this link:--> Get Support

Regards

Giulio

In such a situation, as already suggested, contact Apple Support directly. They will solve your problem.

Regards and best of luck.

Giulio