Google has changed the way the accounts work and are set-up and have slowly affected the way we originally were able to create access through client email addresses. The best way to set up access is for us to add Google Accounts that you have.
These can be existing accounts (Google Account or Gmail Account) or you can create new Google Accounts using your organizations email addresses by going here: https://accounts.google.com/NewAccount and using your work email as "Your current email address:"
As soon as you have an account you want to use to sign-in to your analytics let us know and I will add them to your site set-up.
Let us know if you have questions.