Mobile client hang when select Comfill

Hi,

I have installed Mobile Webtier successfully but whenever I click a comfill button to fill assignment group in incident ticket, web browser always keep loading like capture in attachments. I have tried both Safari in iOS, Chrome in android, Chrome in Windows with User Agent Switcher addons, it still the same.

I have tried to customize other field using comfill, it will keep loading as assignment group.
A strange thing is if I select contact person or affected service in incident , it will load normally.

Is there anyone have the same problem like me? Below is my environment version
App: 9.41.0020
RTE: 9.41.2003
Web: 9.41.2003-P2
Mobile:sm9.41.2000-P2