TOPIC: Group member names do not display in email

Our email confirmation message contains these tags:

{GROUP_MEMBER}
[FIRSTNAME] [LASTNAME]
{/GROUP_MEMBER}

However when the email goes out, only the recipient's name shows in the email, not the full list of group members who were registered.

All members show in the registration records in admin, just missing from the email. :

Using J1.5.26 - DTRegister 2.7.18a - Community Builder 1.8.1

This should just be a setup issue. Please submit a ticket so we can take a look. Tell us which event the email is for. Is the problem only in the user email or admin as well?