Mass email change not taking effect as expected

We are cleaning up things from a company domain change. All emails changed from "@oldname.org" to "newname.org". We are running 12.0.2.8 with OpenDJ as the user LDAP. It was a fairly simple change to update the email addresses in the LDAP. I exported the DB to an ldif, did a mass replace for that email domain and reimported. I verified with the control panel that change was correct, emails domains were updated.

Issue comes with Windchill where the old email is still shown. No problem as I figured this was a caching issue. PTC has a number of articles on this. The email address is stored in the WTUser table.

https://www.ptc.com/en/support/article/CS72994?source=search details how LDAP Sync works. My assumption is that when I changed the LDAP value, there is a process to get Windchill to reread it and update the WTUser table. 

I can confirm that the allowLDAPSynchronization is checked for my users (set to 1). wt.org.userSyncTime is not in wt.properties to it should be a default of 7 days. lastSyncTime for the users is all over the place, some going back years and I know they have logged in recently. I did go to Principal Admin and clicked purge principal cache a few times. I was expecting that system would immediately do a sync to the ldap.

As I was writing this, I am seeing users get their email updated. So is it trigged when the user logs in? Seems to be the case. Very inefficient but I will let it do its thing. I know I can write a sql update that will force the change to the WTUser table but holding off for now.