Medium API Error 6005 – "Application Not Found" Issue on Some Accounts

Hey everyone,

I’ve been using the Medium API for a while now, and everything was working perfectly until today. I published an article 12 days ago without any issues. However, now I’m facing an error when trying to post via the API for some accounts. The error response I’m getting looks like this:

What’s Strange?

• Some accounts are working fine, meaning the API is still functional in general.
• Other accounts return this 6005 error ("Application not found").
• The API was working fine 12 days ago when I last published an article.

Possible Causes I’ve Considered:

1. API Key or Token Issue: Maybe the access token expired or got revoked for some accounts?
2. Changes on Medium’s End: Could Medium have updated its API policies or restricted some applications?
3. Account-Specific Limitations: Certain accounts might have restrictions or be flagged for some reason.
4. App Deletion or Revocation: If an app was deleted or lost its authorization, the API would not recognize it anymore.

Steps I’ve Tried So Far:

✅ Checked my API key and regenerated it for affected accounts.
✅ Verified that the working accounts have the same API setup as the non-working ones.
✅ Logged into the affected accounts manually to confirm they’re still active.
✅ Searched Medium’s API documentation for any updates but found nothing related to error 6005.

Has Anyone Else Faced This?

If anyone has encountered this issue before or knows a fix, I’d really appreciate the help! Could this be a temporary issue with Medium, or is there something I need to change in my setup?

But Some Account working fine

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