Hello there --
When I attempt to add my account (this account sciencekae) to my bookstore's wordpress.com blog located at http://collectedworksbookstore.wordpress.com/ I do not get any sort of email to accept the invitation. I have checked my blacklist and spam folders and nothing has showed up and tried resending the invitation a number of times on two separate days (December 2nd and 4th). Interestingly enough, when I attempted to add a different user who did not have a WordPress.com account they did get the email and were able to accept the invitation. Our email addresses are on the same domain.
Any help with this would be greatly appreciated and I am happy to answer any other questions to riddle out the problem. My account should be made an Administrator and I have access to both accounts.