I’m trying to implement Miro OAuth integration in my application and running into issues during the token exchange process. I can successfully get the authorization code from users when they approve my app, but when I try to exchange this code for an access token using the OAuth endpoint, I keep getting a 401 unauthorized error response.
I’ve double checked my client ID and client secret multiple times and they appear to be correct. The authorization code I’m using is fresh and hasn’t been used before. I’m making a POST request to the token endpoint with the proper headers and body parameters as specified in the documentation.
Has anyone encountered this issue before? What could be causing the 401 error during the code exchange step? Any suggestions on what I might be missing or doing wrong would be really helpful.
are you using the correct token endpoint url? i made this mistake before where i was hitting the wrong api version. also try regenerating your client secret in the dev console - sometimes they get corrupted or invalidated without warning
I ran into this exact problem last month and it turned out to be a timing issue with the authorization code. Even though you mentioned the code is fresh, Miro’s auth codes expire pretty quickly - sometimes within just a few minutes depending on server load. What fixed it for me was reducing the time between getting the code and making the token exchange request. Also worth checking if you’re sending the code_verifier parameter if you’re using PKCE flow, even though it might not be explicitly required in some docs I found it was needed for my setup. Another thing that caught me was making sure the Content-Type header is set to application/x-www-form-urlencoded rather than application/json when posting the token request.
Check your environment configuration carefully - I spent hours debugging this same error only to discover I was accidentally using my development client credentials against the production Miro endpoint. The 401 happens when there’s a mismatch between your app environment and the API endpoint you’re hitting. Also verify that your app has the correct scopes configured in the Miro developer console. I found that even if the authorization step works fine, the token exchange can fail if your requested scopes don’t match what’s actually enabled for your application. Try logging the exact request payload you’re sending to make sure all parameters are formatted correctly and there are no hidden characters or encoding issues in your credentials.
hmm sounds like you might be encoding the client secret wrong? i had similar issue and turns out i was base64 encoding it when miro expects it plain in the authorization header. also check if your redirect uri matches exactly what you registered - even trailing slashes matter
This happened to me recently and the issue was with URL encoding of the authorization code parameter. When Miro redirects back to your callback URL, the auth code sometimes contains special characters that need proper URL decoding before you send it in the token exchange request. I was directly using the code from the URL without decoding it first. Another possibility is that your server clock might be slightly off - OAuth flows are sensitive to timestamp validation and even a few minutes difference can cause authentication failures. Try making the token exchange request immediately after receiving the auth code to rule out any timing-related issues. Double check that you’re not accidentally including extra whitespace or newline characters when reading your client credentials from environment variables or config files.