[BUG] Cannot activate Claude Max from Claude for Open Source

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?

I received an email from the Claude for Open Source program with a link to activate Claude Max for free for 6 months. However, clicking on the link just opens the upgrade page and selecting the Max plan requires a $200 payment.

<img width="1179" height="1285" alt="Image" src="https://github.com/user-attachments/assets/31d03c56-7f06-4eb2-9138-3b528aeff1bd" />

<img width="1179" height="1928" alt="Image" src="https://github.com/user-attachments/assets/3be4f0ef-1a60-423e-a711-add167c34e09" />

What Should Happen?

The link from the Claude for Open Source acceptance email should allow me to activate Claude Max plan for free.

Error Messages/Logs

Steps to Reproduce

1. Click on “Activate Max 20x” link from email
2. Observe that upgrade page is shown, and selecting the Max plan requires a payment

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

v2.1.146

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

_No response_