Let’s break down the most likely causes for this error and walk through actionable fixes:

1. Verify Your Access Token is Valid & Has Correct Permissions #

This is the most common culprit. Your access token must meet these requirements:

• It needs to be a user access token (not a page or app token) tied to a user who has authorized your app.
• It must include the necessary permissions: For user-to-user app requests, you’ll need the user_friends permission (if sending to a friend) or appropriate publish permissions for your app type.
• Use Facebook’s built-in token debugger to confirm the token is active, hasn’t expired, and includes the required scopes.

2. Check Title Parameter Compliance #

Facebook enforces strict rules for app request titles:

• Keep it under 80 characters (exact limits can vary by API version, so stick to concise text).
• Avoid special characters, spammy language, or content that violates Facebook’s Community Standards.
• Test with a super simple title first (like "Test Request") to rule out formatting or content issues.

3. Confirm the Target User ID is Valid #

• If you’re sending a request to the same user who owns the access token, ensure the {userid} matches the token’s associated user ID.
• If sending to a friend, make sure that friend has also authorized your app (you can only send requests to users who have interacted with your app, unless using specific game-related permissions).

4. Use a Supported Graph API Version #

Older API versions may have deprecated or changed app request functionality. Stick to the latest stable version (as of 2024, v18.0+) to avoid compatibility issues.

5. Simplify Your Request to Rule Out Conflicts #

Strip away any extra parameters you might be adding, and send only the required fields:

curl -X POST "https://graph.facebook.com/v18.0/{user-id}/apprequests" \
  -d "access_token={your-valid-user-token}" \
  -d "title=Simple Test" \
  -d "message=Testing app request"

If removing the access token changes the error, that confirms your token is invalid or missing permissions. If removing the title fixes it, your original title was violating Facebook’s rules.

内容的提问来源于stack exchange，提问作者Jesus Oliver