After installing FormsViewer on SharePoint 2016 on premises server, I'm not able to get any data from People Picker in forms.
To be sure, that this is not my existing forms issue, I just created a new form that contains only one People Picker field and nothing else. I've specified my server address in SharePoint Server tab of People Picker properties, as described in Workaround document. When I type in search box below people picker, I see "no results found" and nothing else. When I click on Address Book icon, it starts Querying 1-2 seconds, then also no change.