Copilot CLI stopped working: response validation failed: quota_snapshots.chat.overage_entitlement: Expected number, received null

[cfeval]

Describe the bug

Copilot CLI (v1.0.81-9 and v1.0.81-12) suddenly stopped working, with error:

Error: Authentication token found but could not be validated.   Failed to fetch OAuth user login: response validation failed: quota_snapshots.chat.overage_entitlement: Expected number, received null quota_snapshots.completions.overage_entitlement: Expected number, received null quota_snapshots.premium_interactions.overage_entitlement: Expected number, received null Your token may still be valid.

When trying to /login again:

Error during sign-in: response validation failed: quota_snapshots.chat.overage_entitlement: Expected number, received null
 quota_snapshots.completions.overage_entitlement: Expected number, received null
 quota_snapshots.premium_interactions.overage_entitlement: Expected number, received null

Seems to be a discrepancy with required fields in CLI not available in API yet.

What's more: when using my Microsoft EMU account, it doesn't work. If I use my github corp account, it does.

Affected version

GitHub Copilot CLI 1.0.81-12

Steps to reproduce the behavior

1. /login with Microsoft EMU account

Expected behavior

Login should work

Additional context

macOS (though confirmed colleagues have the issue on Windows)

[cfeval]

Looks like it's already known and being fixed.