User Settings page does not show the email address of the user
After upgrading to portal version 8.9.5, I had planned to modify the UserProfile.js to add some additional fields to be displayed in the user settings page. I've seen today that the page doesn't show the email address of the logged on user and I'm almost sure that this was visible before the upgrade.
We have a multi-forest environment. My admin account which resides in the same forest like the portal server shows the email address on the user settings page. My regular account in a different forest has an empty field. The email field in AD object is definitely populated. The info is also displayed in the user details page when clicking the blue info button and select "view more details".
I haven't edited the UserProfile.js so far, it's still the original version. Am I missing permissions for the application pool identity or any other configuration?