Multiple CLI instances: second window invalidates first window's auth token

[XixiHuang333]

Opening a second Copilot CLI window causes the first window to fail with:

Authorization error, you may need to run /login (Request ID:
CB7B:xx:431DB92:xx:xx)

Running /login in the first window then invalidates the second window. The two instances
keep "stealing" the auth token from each other.

I have been using multiple CLI windows in parallel for nearly 2 months without issues. This problem started approximately in the last few days (late March 2026).

Affected version

1.0.15-0

Steps to reproduce the behavior

1. Open Terminal A, run copilot, start a conversation
2. Open Terminal B, run copilot, start a different conversation
3. Go back to Terminal A and send a message → Authorization error
4. Run /login in Terminal A to re-authenticate
5. Go back to Terminal B and send a message → Authorization error
6. The two windows keep invalidating each other's tokens

Expected behavior

Multiple CLI windows should be able to run concurrently with independent sessions.

Additional context

• OS: Windows 11
• Previously worked fine with multiple windows for ~2 months
• The token appears to be shared/rotated globally rather than per-session

[XixiHuang333]

I found is is my config.json issue. The issue has been fixed already.