Access Token Issues - 403 forbidden

Hello everyone,

 

Yesterday I was having no issues sending a POST request via postman to https://<instancename.highq.com>/<instancename>/api/oauth2/token and providing the below body:

 grant_type: "authorization_code"
 client_id: "###"
 client_secret: "mYsEcRetKey"
 code: "Hh7y8Uy3"

Now I keep getting the below no matter how many new OAuth codes I generate:

{
"summary": "Auth code doesn't exist or is invalid for the client",
"ref": "invalid_grant"
}