Error trying to receive access_token

I am trying to get an access token through OAuth2.0 but everytime I try to do it, I just receive the error below.

Error:: “Cannot use client_credentials with a consumer marked as “public”. Calls for auto generated consumers should use urn:bitbucket:oauth2:jwt instead.”, “error”: “invalid_grant”}

I am trying to send a POST request through HTTPClient but I am not sure what I am doing wrong here.

Code below:

private static async Task<Token> GetEligibleToken()
 var client = new HttpClient();
 string baseAddress = "";

 string grant_type = "client_credentials";
 string client_id = "id";
 string client_secret = "secret";

 var form = new Dictionary<string, string>
    {"grant_type", grant_type},
    {"client_id", client_id},
    {"client_secret", client_secret},

 HttpResponseMessage tokenResponse = await client.PostAsync(baseAddress, new FormUrlEncodedContent(form));
 var jsonContent = await tokenResponse.Content.ReadAsStringAsync();
 Token tok = JsonConvert.DeserializeObject<Token>(jsonContent);
 return tok;