Unable to get Access Token during OAuth flow

[sojtucker (Sam)]

I’m pretty new to this but struggling with the OAuth flow - I’ve logged in via the magic link, got the code from the redirect URL but then putting this in a cURL request to https://api.monzo.com/oauth2/token gives me a “Could not authenticate with provided credentials” error. I’ve double and triple checked the client ID, client secret and redirect URI are correct, I’ve created multiple new Clients in the developer tools, but nothing seems to be working.

I’m assuming it’s not to do with the strong customer authentication not being triggered as I think that happens after receiving the access token, is that correct? It seems to be the same issue as these two threads:

API Could not authenticate with provided credentials

Hi all, I am using the public API for a budgeting application I use personally. I have managed to authenticate using my Monzo account but want to introduce my girlfriend’s account too so that we can sync up our collective budget. However I am unable to Exchange the authorization code for a token(https://docs.monzo.com/#acquire-an-access-token). I receive the following response: { “code”:“bad_request.could_not_authenticate”, “error”:“invalid_request”, “error_description”:“Could not authent…

Recieving 'Could not authenticate with provided credentials' during OAuth flow, everything seems right

Hi All, I know this is similar to #47212 but there’s no resolution there. I’m trying to setup an OAuth flow, and for the most part it works fine, but it’s the post to /oauth2/token that fails, the only POST request in the process I tried it using curl too with: curl -X POST ‘https://api.monzo.com/oauth2/token’ -H ‘Accept: /’ -X POST --data ‘grant_type=authorization_code&client_id={clientid}&client_secret={secret}&redirect_uri={redirectURI}&code={code}’ where anything in {} has been redacted…

But neither of them seem to help give me a resolution. Any other suggestions? is there an issue with the API?