Can't Post to Threads via threads_content_publish Despite Being Authorised Tester 🤔

I’m testing the Threads API using the threads_content_publish permission on my Meta App (ID: 679279907871546). I have the correct access token with all relevant scopes (confirmed via the Token Debugger), and my Threads tester account is properly authorised.

:white_check_mark: threads_basic calls work fine and return data.

:cross_mark: But when I attempt to make a POST request to:

[https://graph.threads.net/v1.0/{user-id}/media](https://graph.threads.net/v1.0/{user-id}/media`)

…with the required parameters (image_url, media_type), I consistently receive this error:

“Unsupported post request. Object with ID ‘9573980985973886’ does not exist, cannot be loaded due to missing permissions, or does not support this operation”

I’ve tried:

  • cURL, Postman, and Graph API Explorer

  • Using me and the full user ID

  • Ensuring I’m using a valid Threads image URL and correct header authorisation

Everything appears to be configured correctly, and the app shows “Ready for testing” for threads_content_publish.

Is this a bug or is something missing from the setup?