#Get the Access Token

var identityServiceUrl = "{https://identity.avepointonlineservices.com}";
var client = new HttpClient();
var disco = await client.GetDiscoveryDocumentAsync(identityServiceUrl);
if (disco.IsError)
{
    return;
}
var tokenResponse = await client.RequestClientCredentialsTokenAsync(new ClientCredentialsTokenRequest
{
    Address = disco.TokenEndpoint,
    ClientAssertion = new ClientAssertion()
    {
        Type = OidcConstants.ClientAssertionTypes.JwtBearer,
        Value = CreateClientAuthJwt(disco)
    }
}
if (tokenResponse.IsError)
{    
    return;
}
return  tokenResponse.Json
private static string CreateClientAuthJwt(DiscoveryDocumentResponse response)
        {
            var clientId = "{Client ID}";
            var certificateThumbprint = "{Certificate Thumbprint}";

            // set exp to 5 minutes
            var tokenHandler = new JwtSecurityTokenHandler { TokenLifetimeInMinutes = 60 };

            var securityToken = tokenHandler.CreateJwtSecurityToken(
                // iss must be the client_id of our application
                issuer: clientId,
                // aud must be the identity provider (token endpoint)
                audience: response.TokenEndpoint,
                // sub must be the client_id of our application
                subject: new ClaimsIdentity(
                  new List<Claim> { new Claim("sub", clientId),
                  new Claim("jti", Guid.NewGuid().ToString())}),
                // sign with the private key (using RS256 for IdentityServer)
                signingCredentials: new SigningCredentials(
                  new X509SecurityKey(new X509Certificate2(LoadCertificate(certificateThumbprint))), "RS256")
            );
            return tokenHandler.WriteToken(securityToken);
        }
private static X509Certificate2 LoadCertificate(string certificateThumbprint)
        {
            var store = new X509Store(StoreName.My, StoreLocation.LocalMachine);
            store.Open(OpenFlags.ReadOnly);
            var vCloudCertificate = store.Certificates.Find(
                    X509FindType.FindByThumbprint,
                    certificateThumbprint,
                    false)[0];
            return vCloudCertificate;
        }