Cannot add elements to Net Calculation Window of Absence Plan

I set up an accrual plan, and I am not able to select the element I created to add to it. The client has a policy where everyone receives 8 hours of vacation on January 1. I created an absence element, linked it, and it is not available in the List of Values in the Net Calculation window. I tested this in a Vision instance and it worked with no problem. Have I missed a step?

Thank you!