Registering a UK 3DS with Club Nintendo US – Not Possible

No. Club Nintendo was region‑locked. A UK (European) 3DS can only register with a Club Nintendo Europe account (UK, DE, FR, ES, IT, NL, etc.).

Why Region Lock Exists

• Reward catalogs differ – Physical rewards (statues, soundtracks) ship regionally.
• eShop tie‑in – Points linked to region‑specific eShop purchases.
• Legal / tax – Loyalty programs comply per jurisdiction.

What to Do

1. Create Club Nintendo account for your actual region (club.nintendo.co.uk for UK).
2. Register 3DS + games there.
3. Redeem rewards available in that catalog.

Note: Club Nintendo Is Defunct

• Closed globally: 2015 (JP), 2017 (EU/US).
• Replaced by My Nintendo (accounts.nintendo.com) — also region‑locked.
• 3DS eShop closed March 2023; no new points earnable.

If you have unredeemed codes from physical games, they’re likely expired. Contact Nintendo Support with proof of purchase—long shot.