Below are the screen shot email samples coming from sharepoint when users request access to a certain site. My issue is highlighted in red box.
If the user belong to TECH domain (Figure 1), the request email have the requester’s name beside the logon id(Y699898). But the names of the users who belong to CORP domain are not displayed on the email when they request for access to a site(Figure 2).
Figure 1

Figure 2

Figure 3

Is there a way I can figure this thing out?
My client wanted to make the request uniform in such a way that every time that there will be a request, the name of the user is always beside the logon id.
All formats should look the same as Figure 1. I’ve been looking for solutions on the internet about this issue but found no answer.
I’m hoping that somebody here in stackoverflow could help me solve this issue.
Thank you so much.
Note: TECH is a domain by itself. Likewise for CORP, it is also a domain. Both domains are connected to exchange server(Outlook).