Job was able to open Pop up in 4.5 Autosys but its unable to open pop up in 11.3+ WAAE version.
This issue occurs because by default 4.5 Agent is interactive and system Agent is not.
To make 11.3+ version Agent support as Interactive we have to add below parameter to jil, so that the specific job on Agent works as interactive.
interactive: y | n
Note # This is only for job level.
If you need entire Agent 11.3+ Agent to behave as interactive, you have to add below parameter in agentparam.txt file.
Please refer the below document.