Approval Definition -> Lookup Group approver not found in SMAX 24.1

Hi Experts,

We need to retrieve the group member's approver from a different module in SMAX (custom app).

For example, when an end-user selects a module name from the list, the system should be able to select the predefined approver in the custom app.

Below is the expression that was created, but it is not working and shows "not found."

${lookup('CustomAPP_c','Group_c','DisplayLabel',entity.UserOptions.Module_c.DisplayLabel)}

where CustomAPP_c -> Name of the custom table
           Group_c -> a field we need to show and holds the group name
           entity.UserOptions.module_c.DisplayLabel  -> Based on the selected module.
Output 
 
The same rule works (displays the group) when we use it outside the approval definition.