I’m working on implementing Miro OAuth integration for my application and I’m running into an issue during the token exchange process. I successfully completed the first two steps of the OAuth flow - setting up the app and getting user authorization. However, when I try to exchange the authorization code for an access token (step 3), I keep getting a 401 ‘Invalid authorization code’ error.
I’ve double-checked my client ID and client secret multiple times, and I’m sure they’re correct. The authorization code I’m using is fresh and hasn’t been used before. I’m making the POST request to the token endpoint with all the required parameters, but it still fails.
Has anyone encountered this issue before? What could be causing the authorization code to be considered invalid even when everything seems to be set up correctly?
Had the same headache last month! My app was registered for a different environment than what I was testing against. Check if your client credentials match your actual Miro app environment (dev vs production). Also make sure the authorization URL domain matches your token request domain - I mixed up API endpoints between regions and got endless 401s until I caught that stupid mistake.
Check your authorization code’s timestamp - they expire in 10 minutes. I hit the same 401 error because I was too slow between steps during manual testing. Once that code expires, it’s dead even if you haven’t used it yet. Also watch out for case sensitivity in your client credentials. I know you’ve checked them already, but look for trailing spaces or wrong capitalization. One more thing - make sure your request headers use application/x-www-form-urlencoded, not application/json. Miro’s token endpoint is picky about this.
I faced a similar problem not too long ago, and it was quite nerve-racking. The solution for me was to ensure I was encoding the authorization code properly before sending it with the POST request. I found that even the slightest mistake, like copying the code incorrectly including any hidden characters, could lead to a 401 error. Also, check that the redirect_uri you used during the token request is exactly the same as the one in the exchange step. Any mismatch, no matter how minute, can disrupt the process and result in an invalid authorization code error.
Had this exact same issue during a weekend integration sprint. Turned out I was generating the code_verifier correctly for the auth request but forgot to include the matching code_challenge in my token exchange. Some Miro setups require PKCE even when it’s not mandatory - check if you’re handling it right or try disabling it temporarily if you can. Also got burned by URL encoding issues with special characters in the auth code. The code looks fine when you get it, but certain characters need proper encoding when you POST it back.