Access Project online api on sharepoint online on c#

I have a sharepoint (myAzure.sharepoint.com). Inside I got a site PWA (project online). PWA offert OData Api. The security of that Api required a User member of your AD (not an app).

I want, in c#, to consumme the api outside azure (like localhost). I need to do it without interractive (web promp interraction with the user).

The only way I found was by "password credential".

string url = $"https://login.microsoftonline.com/{myTenantId}/oauth2/v2.0/token";
var formData = new NameValueCollection();
formData.Add("client_id", clientId);
formData.Add("client_secret", clientSecret);
formData.Add("username", username);
formData.Add("password", password);
formData.Add("scope", $"https://{myAzure}.sharepoint.com/.default");
formData.Add("grant_type", "password");
string encodedFormData = string.Join("&", Array.ConvertAll(formData.AllKeys, key =>
string.Format("{0}={1}", Uri.EscapeDataString(key), Uri.EscapeDataString(formData[key]))));

var request = (HttpWebRequest)WebRequest.Create(url);
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";

byte[] formDataBytes = Encoding.UTF8.GetBytes(encodedFormData);
request.ContentLength = formDataBytes.Length;
using (var requestStream = request.GetRequestStream())
{
	requestStream.Write(formDataBytes, 0, formDataBytes.Length);
}

using (var response = (HttpWebResponse)request.GetResponse())
{
	using (var responseStream = response.GetResponseStream())
	{
		if (responseStream != null)
		{
			using (var reader = new System.IO.StreamReader(responseStream))
			{
				string responseContent = reader.ReadToEnd();
				JObject jsonResponse = JObject.Parse(responseContent);
				string accessToken = (string)jsonResponse["access_token"];

				using (HttpClient client = new HttpClient())
				{                                
					client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", accessToken);
					HttpResponseMessage response2 = await client.GetAsync($"https://{myAzure}.sharepoint.com/sites/{myPWASite}/_api/ProjectData/Ressources");
				 
					if (response2.IsSuccessStatusCode)
					{
						string responseBody = await response2.Content.ReadAsStringAsync();
						Console.WriteLine(responseBody);
					}
					else
					{
						Console.WriteLine("Erreur: " + response.StatusCode);
					}
				}
			}
		}
	}
}

Explanatory documentation

• https://learn.microsoft.com/en-us/azure/active-directory/develop/v2-oauth-ropc
• https://techcommunity.microsoft.com/t5/project-support-blog/app-user-authentication-and-project-online-development/ba-p/1925443
• https://learn.microsoft.com/en-us/azure/data-factory/connector-odata?tabs=data-factory#copy-data-from-project-online