I have an Email Service with an Apex class that creates a new EmailMessage object associating the sender with a Contact in the system and the recipient as a User. The email shows up correctly with all the fields populated but without the "Reply" buttons. When I create an email from a User to a User the buttons are visible.
I am also creating an EmailMessageRelation as per the EmailMessage docs, and setting the ToIds field on the EmailMessage which is supposed to automatically associate it with the recipient (User) as described in the following docs snippet:
According to the above I should have the "Reply" functionality but for some reason I am not getting it. Any insight would be appreciated.