Hi Harsh,
you can do something like this: instead of "complete task" on the current page, change the action to call a microflow, create a new microflow with validation inside.
In the submicroflow for validation, you will check if Reason != empty, if it is filled in, you proceed, if not, you change the variable to false and display validation in the place of the entered reason.
In the example given, I am checking if a phone model is selected, if it is not, I display information to choose a phone model.
If you want pop-up, then change validation message to show message
I hope I helped. If so, please accept the answer.
Best regards,
Adam
Hi Harsh,
have a look at this forum post, which describes the issue and gives a solution.