This article addresses the request failed: 400 error that can appear in Atlas Agent when submitting a hero image prompt. A 400 error means the request was rejected before it was processed.
Before reaching out to our team, try the self-serve steps below — many users are able to resolve this by adjusting their prompt.
🔧 Self-Serve Steps to Try First
- Retry the prompt: Occasionally a transient issue can cause a 400 error. Submit the exact same prompt again to see if it succeeds on a second attempt.
- Simplify the prompt: Shorten your hero image prompt to the core description, removing any extra instructions, punctuation, or formatting. A very long or complex prompt can sometimes trigger a rejection.
- Check for unsupported characters: Remove any special characters (e.g., /, &, <, >, quotes within quotes) from the prompt text and try again.
- Try a different prompt entirely: Write a new, plain-language description of the hero image you need. If this succeeds, the issue is specific to something in your original prompt wording.
- Reload the page and try again: Refresh your browser, navigate back to the Atlas Agent project, and resubmit the prompt to rule out a session-level issue.
📋 If the Error Persists — What to Prepare Before Reaching Out
If none of the steps above resolve the error, our team will need to investigate on a case-by-case basis. Please have the following ready:
- Your project name: The exact name of the project where the error occurred.
- The exact error message: Copy the full error text as it appears on screen (e.g., request failed: 400).
- The hero image prompt you submitted: Include the full text of the prompt that triggered the error.
- Timestamp: Note the date and approximate time when the error occurred.
- Steps you already tried: Any actions you took before or after the error appeared, including which self-serve steps above you attempted.
✅ Next Steps
Having the information above ready will allow our team to identify the cause and apply the correct fix without unnecessary back-and-forth.
If you need further assistance, open the chat widget in the bottom-right corner of the platform and type human teammate to be connected with a member of our team.