Hi,
I have enabled the Convert to PDF functionality for a custom entity, and configured word templates appropriately. When I use the Email PDF option, the new Enhanced Email pops up as expected, but the To field and the Regarding field is blank. Looking at the browser Developer Tools (F12), I get this message

I can see the problem is that the custom entity has no Customer field, and the email form cannot populate the To field, but it should populate the regarding field without any error in javascript. So I think it's a bug for Microsoft.
Is anyone having the same issue?
Kind regards,
Khoa