Getting 401 unauthorized error when exchanging auth code for access token in Miro API

I’m trying to integrate Miro’s OAuth process into my app, but I’m facing an issue. The initial step where users authorize my app goes smoothly, and they can grant permissions without any trouble.

However, I’m running into problems when I attempt to exchange the authorization code for an access token via a POST request. I’m consistently receiving a 401 unauthorized error. I’ve checked my client ID and client secret numerous times to ensure they’re accurate. The authorization code I’m using is new and hasn’t been utilized yet.

Has anyone experienced a similar issue with Miro’s OAuth? I feel like I might be missing some details in the request format or headers. Any insights on what could be causing this authentication problem would be greatly appreciated.

Double-check you’re putting the authorization code in the request body as the code parameter - not in the URL or headers. I screwed this up when I first used Miro’s API and stuck the auth code in completely the wrong spot. Your POST body needs grant_type=authorization_code, code=your_auth_code, and redirect_uri. Make sure you’re using POST, not GET. Wrong scope in the initial auth request also bit me - it’ll break token exchange even when the auth code looks fine. Still having issues? Try the request in Postman first to figure out if it’s your code or how you’re formatting the request.

had the same issue, man! before sending, you gotta base64 encode your client_id and client_secret like “client_id:client_secret” and don’t forget "Basic " in front! check if your redirect_uri matches what you set in Miro too.

You’re getting a 401 because something’s wrong with your Authorization header format. Check that you’re hitting the right endpoint (https://api.miro.com/v1/oauth/token) with Content-Type as application/x-www-form-urlencoded. Your auth code might’ve expired - they only last 10 minutes. Also make sure your redirect_uri matches exactly what’s in your Miro app settings. I mean exactly - trailing slashes, query params, everything. I’ve seen tiny URI differences kill the auth even when everything else looks perfect.