The key is missing, or it is wrong for this host. Send Authorization: Token YOUR_API_KEY with a key issued for this environment.

The key's user does not have access to set tags on accounts. Ask Coris support. A scoped key cannot use this route, and gets JSON with detail. Use a key without account limits.

No item has this ID in your workspace. Check the ID and the environment.

You passed a rate limit. If Retry-After is present, wait that many seconds, then retry. If it is absent, you hit the concurrency limit, so back off for a few seconds and reduce parallel calls.

Coris could not complete the request. Retry with backoff. If it continues, contact support.