Unable to add "SendGrid" Add-on

Hi,

We would like to evaluate "SendGrid", so in the Windows Azure portal I tried to add SendGrid Add-on, but on step 3 (last one), I get the following error (I tried at least 3 times on different days) :

We're sorry, we cannot estimate the bill at this time. Please try again later. If the error persists, contact support with the following information.

(Internal Server Error)

In step 2, I chosed :

- PLAN : Free

- Name: SendGrid

- REGION : West Europe

It's very important for us to evaluate this one asap.

Thanks