A request cannot be made against the Windows Azure Service Management API. Make sure that subscription ID is valid and a ...

A request cannot be made against the Windows Azure Service Management API. Make sure that subscription ID is valid and a certificate with the following thumbprint is associated with you subscription: {0}.
You can execute the following command to generate a new API certificate: TfsAzureCert CreateApiCert -f TfsApiCert.cer 
To associate a certificate with your subscription, login to the Windows Azure Portal, select your project, click on Account tab and navigate to Manage My Certificates. Upload the .cer file that is associated with your certificate to the Portal.