Benefits Health Plan Loss of dependant at turning 26 continuation till end of month

We have an issue where an employee’s dependents (Child, Step Child, Child of DP) are eligible for benefits until the end of the calendar month that they attain the age of 26. Currently, SAP allows dependents to be added up until their 26th birthday.  For example, a dependent with a date of birth of 08/15/1989 can be added to a benefit plan with an effective date prior to 08/15/2015.  However, SAP will not allow this same dependent to be added from 08/16 through 08/31

To achieve this requirement, we Configured the same as

Step 3:

But it didn’t work.Please Help