We are preparing for upgrade, and in our testing most things work, but we found that lookups are not behaving correctly, as the value selected is never getting populated, and always comes back as null in the response. As stated this is only happening in the new D365 UCI, and works in the old web UI in D365 v9.
The lookup prompt behaves the same and pops up correctly but nothing is ever returned:
![image](https://user-images.githubusercontent.com/48500644/66901871-43aaef00-f04b-11e9-8bf5-89f268148b62.png)
var options = getOptions();
var fieldsArray = [
new Alert.Lookup(
{
id: "actionofficer",
entityTypes: ["systemuser"],
customFilters: ["<filter type='and'><condition attribute='isdisabled' value='0' operator='eq'/></filter>"]
}, { style: "margin-top:20px" })];
new Alert(options).showPrompt(fieldsArray);
function successCallBack(responses){
var user = responses[0].value;
}