Would you please share how the program rule variable is configured? In this case, when you need to get a value from another separate stage, a program rule variable is required.
Probably it’ll be (Data element from the newest event for a program stage) as you can see in the screenshot:
Thank you for your response. Sure, I will share how I configured the program rule variable. I have tried both “Data element from the newest event in the current program” and “Data element from the newest event for a program stage”, but I faced the same issue. I will also share a screenshot of the program rule variable configuration.