I’m experienced in .NET but pretty new to Sharepoint and Project Online. I am curious if it’s MFA or what is going but I always get a

The remote server returned an error: (403) FORBIDDEN

For the code

public async Task<ProjectContext?> GetContextWithCredentialsAsync(string url, string username, string password)
{
    try
    {
        if (url.ToUpper().StartsWith("HTTP://") || url.ToUpper().StartsWith("HTTPS://"))
        {
            var securePassword = new SecureString();
            password.ToCharArray().ToList().ForEach(s => securePassword.AppendChar(s));

            var clientContext = new ProjectContext(url)
            {
                
                Credentials = new NetworkCredential(username, securePassword)
        };
            clientContext.Load(clientContext.Projects);
            clientContext.ExecuteQuery();

            return await System.Threading.Tasks.Task.Factory.StartNew(() => { return clientContext; });
        }
    }
    catch (Exception ex)
    {
        throw ex;
    }

    return null;
}

I have seen other similar code online doing this and I think maybe it is MFA and I need to get an auth but other links I have seen were older .NET. I am using the library: ‘Microsoft.SharePointOnline.CSOM’ version 16.1.24810.12000 in a .NET 8 Web API calling the code above.