---
title: Fix Grok API Authentication Errors in Hermes Agent
description: "Diagnose xAI key rejection, missing provider credentials, and runtime authentication errors in a Grok-backed Hermes Agent."
canonical: "https://deploy-hermes.com/troubleshooting/grok-api-authentication-errors"
last-updated: "2026-08-23"
---

# Fix Grok API Authentication Errors in Hermes Agent

> Diagnose xAI key rejection, missing provider credentials, and runtime authentication errors in a Grok-backed Hermes Agent.

Canonical: https://deploy-hermes.com/troubleshooting/grok-api-authentication-errors
Updated: 2026-08-23 · Search intent: troubleshooting
Category: [Troubleshooting](/troubleshooting)

A Grok API authentication error means the xAI credential boundary needs attention, but not every failed agent run is a bad key. Use a short evidence-first sequence: inspect connection status, validate the key, confirm provider policy, and then inspect the run result.

## Identify which credential failed

Confirm that the workspace has an xAI provider connection and that its status is active. A missing connection is different from a key rejected by xAI, and both are different from a Telegram token or pairing failure.

Do not paste the key into a support chat to compare it. Use the provider settings flow to reconnect it, and read the non-secret account label to confirm that you selected the intended provider.

## Reconnect through validation

If xAI rejected the key, check the xAI account and key state, then paste the corrected key into DeployHermes. The connection action calls xAI's models endpoint before sealing the credential. A successful validation is the cleanest evidence that the credential itself is accepted at that moment.

If validation succeeds but a run still fails, inspect provider selection and runtime policy. The run may be using another provider, a disallowed model path, or a credential that was rotated after connection.

## Separate auth from delivery

A completed xAI request with no Telegram reply is not an xAI authentication error. Check pairing, channel delivery, and the final run state separately. Likewise, a Telegram message that reaches the runtime does not prove the provider returned a usable response.

Once fixed, run a harmless request and record the provider attribution and terminal outcome. This creates evidence for the next incident without exposing the secret.

## Frequently asked questions

### Why does a key that worked yesterday fail today?

It may have been revoked, rotated, restricted, or selected through a different provider policy. Revalidate through the xAI connection flow and inspect the current run evidence.

### Should I restart Telegram when xAI rejects a key?

Usually no. Fix the provider credential first. Restarting or re-pairing the channel does not repair a key rejected by xAI.

## Sources

- [xAI quickstart](https://docs.x.ai/developers/quickstart) (as of 2026-08-23)
- [xAI inference API reference](https://docs.x.ai/developers/rest-api-reference/inference) (as of 2026-08-23)

---

- [Full documentation index](/llms.txt)
- [Complete site text](/llms-full.txt)
- [Developer portal](/developers)
- [OpenAPI contract](/openapi.json)
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