[BUG] Claude Max 5x gift subscription automatically canceled — account reverted to Free plan

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

My Claude Max 5x gift subscription was automatically canceled without any action on my part. Account now shows Free plan despite having a valid paid invoice (#KK5AF2KX-0009, April 8 – May 8, 2026, $0.00 gift).

What Should Happen?

Max 5x plan should remain active until May 8, 2026.

Error Messages/Logs

Steps to Reproduce

1. Redeem a Claude Max 5x gift code → success, plan activates
2. Use the plan normally for a couple of days
3. Log in again → account shows Free plan, subscription shows as canceled
4. Try resubscribe → system asks for £90, ignores gift entitlement
5. Try re-redeem gift code → shows "Gift already redeemed"

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

N/A

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

This is a billing/account issue, not a Claude Code CLI bug. Posting here because the support bot (Fin AI Agent) explicitly stated it cannot escalate to human agents. Invoice #KK5AF2KX-0009 confirms valid gift subscription. Related issues: #44163, #41581, #31012, #1298 (anthropic-sdk-python). Root cause appears to be Stripe canceling gift subscriptions via $0.00 proration logic on 100% discount coupons.