Yes, i have access to ESRI Support. I will call and ask them about this issue? I know that William mentioned it as possible database issue. We have a SQL environment.
I got on AGOL, the expression is no longer grayed out and the required field works as mentioned in the correct answer.
Thank you for verifying that Heath
Just so I'm clear in what you're saying, it does not work in Portal but it does work in ArcGIS Online?
That is correct. We are running Portal at 10.6.1 and it does not work. However, it does work in ArcGIS Online.
Is there any information on when this function will be available in Portal?
I am trying the steps for option #2 like you mentioned. I get the red asterisk next to the field I want the user to have to change but it still allows them to save without changing.