[BUG] Claude Max subscription downgraded to Free plan without user action

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 subscription was automatically downgraded
to Free plan with approximately 19 days remaining.
No cancellation or changes were made by me.
Settings → Billing now shows Free plan.

<img width="1818" height="880" alt="Image" src="https://github.com/user-attachments/assets/39800de4-c83d-4237-a940-c90eab7b4c96" />

What Should Happen?

My Claude Max subscription should remain active
for the full paid period (~19 remaining days).

Invoice-XHSFW74C-0003.pdf
Receipt-2726-4036-3874.pdf

Error Messages/Logs

None - silent downgrade with no notification or email.

Steps to Reproduce

1. Purchase Claude Max subscription
2. Use normally for ~11 days
3. Account automatically reverts to Free plan
4. No action taken by user

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

na

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

• Account email: xuongphimquocdoanh@gmail.com