I’m working on integrating Miro’s OAuth flow into my application and I’m running into a problem. I’ve been following the official documentation to set up user authentication for my Miro app integration. Everything works fine until I reach the step where I need to exchange the authorization code for an access token. When I make the POST request to get the access token, I keep getting a 401 unauthorized error response. I’ve double checked my client ID, client secret, and the authorization code I received from the previous step. All the credentials appear to be correct and I’m using the exact same values that were provided during the app registration process. Has anyone else encountered this issue with Miro’s OAuth implementation? What could be causing this authentication failure even with valid credentials?
The 401 error you’re encountering is likely related to your environment configuration. I experienced a similar issue when my development environment was mistakenly pointing to the wrong OAuth endpoint or using outdated credentials. Ensure you’re using the correct production OAuth URL instead of a sandbox if your application is live. A common issue is scope mismatches; your authorization scopes must align perfectly with those requested during the token exchange. Additionally, verify that no recent changes were made to your app’s OAuth settings in the Miro dashboard, as regenerating credentials invalidates stored client secrets without prior notice. It may help to generate a new auth code and try exchanging it immediately to avoid any caching issues.
check your base64 encoding if you’re using basic auth instead of form params. also had this bite me - make sure you’re not mixing up the client secret with the signing secret from your app dashboard. they look similar but are totally different things!
Check if you’ve already used that auth code. Miro’s codes only work once - after you exchange them for a token, they’re dead. I wasted hours on this same error because my test setup kept hitting the exchange endpoint multiple times with the same code. Make sure you’re sending your client credentials in the request body, not as Authorization headers. Miro wants client_id and client_secret as form parameters in the POST body with your code and grant_type. Watch out for whitespace in your credentials too - I had trailing spaces in my client secret once that broke everything.
omg i had the same issue! make sure your redirect uri is spot on with what you have in the app settings. even a tiny diff, like an extra slash, can mess things up! and yeah, don’t url-encode the client secret - i did that too, sooo frustrating!
Had this exact problem a few months back - it was a timing issue with the auth code. Those codes expire fast, usually within 10 minutes. If you’re debugging and taking your time between steps, the code dies before you can use it. Double-check you’re hitting the right endpoint: https://api.miro.com/v1/oauth/token. Also make sure your Content-Type header is set to application/x-www-form-urlencoded for the POST request. The API’s picky about request format but the docs don’t really stress this.