What you saw
Why it happened
The token shape is right (mnfst_...) but no matching harness exists. Usually that means the key was rotated and your client still has the old value, or the harness itself was deleted, or you copied a key from a different workspace.
How to fix it
- Open the dashboard, find your harness, and copy the current key.
- Paste it into your client’s config. If the harness is gone, create a new one and copy its key.
- On a self-hosted install, double-check that your client is hitting the right backend URL.