Hi @Sandeep,

Here is my understanding, You created a section and inside you have a button.

Now in button Actions, you configured 2 actions 1. RUn activity and 2. Open assignment and you are passing case Key which you created from the activity

If yes, Please try below things.

While rendering  the section, we will get a markup form server, so all the actions should be loaded on initial load, In first action you created one activity from that you are creating new case , but while second action executing it won't get Key which you are passing because it won't be available to client side, but for the second time if you perform, it will able to find it.

Follow below steps  to get the value to client side using Change Tracking mechanism, so it will work

1. In the section, add pxHidden control and give property name as pyInsKey 

2. In the button property panel, add the first action as  Refresh-This-Section and call the activity to create a case and store pyInsKey, and in the second active set use Open Assignment and pass the pyInsKey.

Please let me know if you need any additional information?

If Its working fine please mark it as a correct answer.

I believe the previous reply was correct. In the action set, are you not seeing the "refresh" one under "display"?

You would call your activity from the "refresh" action. The refresh action allows you to call an activity after the refresh is done.

Did I miss something?