/oauth2/token route is returning a binary in response

Hey Greg, thanks for your reply and sorry the dalay!

I did as you suggested and printed the headers for both environments and they were pretty much the same, the only difference were in the request headers:

// Request Headers Development
 AxiosHeaders {
  Accept: 'application/json, text/plain, */*',
  'Content-Type': 'application/x-www-form-urlencoded;charset=utf-8',
  'Accept-Encoding': 'gzip, compress, deflate, br',
  'User-Agent': 'axios/1.3.3',
  'Content-Length': '240'
}

// Request Headers QA
 AxiosHeaders {
  Accept: 'application/json, text/plain, */*',
  'Content-Type': 'application/x-www-form-urlencoded;charset=utf-8',
  'User-Agent': 'axios/1.2.0',
  'Content-Length': '199',
  'Accept-Encoding': 'gzip, deflate, br'
}

// Response Headers - Dev 
AxiosHeaders {
  'cache-control': 'no-cache, no-store, must-revalidate',
  expires: '0',
  pragma: 'no-cache',
  'x-content-type-options': 'nosniff',
  'x-frame-options': 'SAMEORIGIN',
  'x-server-response-time': '216',
  'content-type': 'application/json',
  'accept-encoding': 'identity,gzip',
  date: 'Mon, 25 Sep 2023 18:50:34 GMT',
  server: 'envoy',
  vary: 'Accept-Encoding',
  'x-dropbox-response-origin': 'far_remote',
  'x-dropbox-request-id': '75143489d10744ea8ef2f4a1175eda99',
  connection: 'close',
  'transfer-encoding': 'chunked'
} 

// Response Headers - QA
 AxiosHeaders {
  'cache-control': 'no-cache, no-store, must-revalidate',
  expires: '0',
  pragma: 'no-cache',
  'x-content-type-options': 'nosniff',
  'x-frame-options': 'SAMEORIGIN',
  'x-server-response-time': '510',
  'content-type': 'application/json',
  'accept-encoding': 'identity,gzip',
  date: 'Mon, 25 Sep 2023 14:49:36 GMT',
  server: 'envoy',
  vary: 'Accept-Encoding',
  'x-dropbox-response-origin': 'far_remote',
  'x-dropbox-request-id': '9e5db6680a4542648248855fc72ff50d',
  connection: 'close',
  'transfer-encoding': 'chunked'
} 

So as you can see the difference is only in the Request Headers, in the Accept-Encoding and User-Agent headers, altough the version of Axios in both environments is the same, the user agent is different.
I added a Accept-Encoding header like the one i'm using in Dev, but still the same