Persistent "Authentication failed" error on every message - kiro-cli 1.28.1

[warrendeleon]

Bug: Persistent "Authentication failed" error

Version: kiro-cli 1.28.1
OS: macOS
Model: claude-opus-4.6

Steps to Reproduce

1. Run kiro-cli logout then kiro-cli login (login succeeds)
2. Start a conversation or resume one with kiro-cli chat --resume
3. Send any message

Expected Behavior

Authentication should remain valid after a successful login. Token refresh should work transparently.

Actual Behavior

Every message returns:

Authentication failed. Your session may have expired. Run kiro-cli login to re-authenticate.

• Happens immediately and repeatedly — not after a long session
• Even kiro-cli chat --resume fails before any user input
• Context usage is only 3%, so it's not a context limit issue
• Tried: logout/login cycles, switching models, fresh sessions, updating CLI — none resolve it
• Issue has been present since day one of using kiro-cli
• Some sessions work fine, others fail on every message with no clear pattern

[github-actions]

🤖 Potential Duplicate Detected

This issue appears to be similar to:

• #6255: Cannot login via CLI (85% similar)
• #5475: Login issues when switching between IdC and Social sign ins (85% similar)
• #4681: can't login kiro (85% similar)

What happens next?

• ⏰ This issue will be automatically closed in 3 days
• 🏷️ If this is not a duplicate, you can prevent automatic closure by adding a comment or reacting with 👎 to this message.
• 💬 Comment on the original issue if you have additional information

Why is this marked as duplicate?
Both report CLI authentication/login issues on macOS, though #6255 focuses on initial login failure while the new issue reports persistent authentication failures after successful login

[warrendeleon]

👎

[github-actions]

Thank you for your feedback! 🙏

The duplicate label has been removed and this issue has been sent back for maintainer review.

A maintainer will review this issue shortly.