Zen signup fails after successful Google and GitHub authentication: Invalid email

Description

I am unable to create or access an OpenCode Zen account.

Both authentication providers complete successfully:

1. Google with a personal, normal @gmail.com account
2. GitHub with a verified email address

After authentication redirects back to OpenCode, the browser displays a blank page containing:

{"error":"No authorization code found.","cause":{"error":"server_error","error_description":"Invalid email"}}

The identical error occurs with both providers.

Additional information:

• Personal Gmail account (not Google Workspace)
• Verified GitHub account
• Chrome 150
• Incognito mode tested
• Cookies cleared
• Both Google and GitHub authentication complete successfully.
• The error only occurs after OpenCode redirects back from the authentication provider.

Plugins

None

OpenCode version

Not installed. This occurs during account authentication on the website.

Steps to reproduce

1. Go to https://opencode.ai/auth
2. Click "Continue with Google".
3. Authenticate successfully with a personal Gmail account.
4. After Google redirects back to OpenCode, a blank page appears containing:

{"error":"No authorization code found.","cause":{"error":"server_error","error_description":"Invalid email"}}

5. Repeat using "Continue with GitHub".
6. The exact same error occurs.

Screenshot and/or share link

Operating System

Ubuntu 18.04 LTS

Terminal

Not applicable (website authentication issue)