I'm having trouble configuring the SendGrid add-on for Heroku.
Yesterday, I got the SendGrid addon for a heroku app. In heroku, I clicked on the SendGrid add-on link. This brought be to SendGrid. There, SendGrid sent an authentication email to the default that Heroku gave me (appXXXXXXXXX@heroku.com). I didn't do anything else, I just closed the page.
Today, I logged into Heroku again and clicked on the SendGrid add-on link. A new tab opened and I got a 403. After seeing this SendGrid page, I decided to log in to SendGrid manually with credentials from the Heroku config variables. The username was appXXXXXXXXX@heroku.com, same as above. This gave me the error
"You are not authorized to access SendGrid, please contact Support."
I am currently waiting to hear back from their support team, but thought that asking SO might be quicker. Does anyone know what I did wrong and how to gain access to the SendGrid config?
EDIT: There are some SendGrid tickets about this, but there is no explanation or resolution: #806, #874