Dax filter for specific scenario

Question

To help prioritize permit application review, I want to know which department is the last to review an application when there is more than one department assigned to review it. I have a list of the application numbers, departments and the corresponding status of the department.

AppNum	Dept	DeptStatus
985211	BIOL	Request
985211	DENG	Pending Review
985211	FIRE	Request
985211	FPSV	Request
985211	PLAN	Received Back
985217	BIOL	Request
985217	DENG	Pending Review
985217	PLAN	Pending Review

The logic in my head is to first find when the count of AppNum is greater than one. Then look at the DeptStatus and for when "Pending Status" is only one of those rows.

So in my example table, AppNum 985211 DENG would be included, but AppNum 985217 would not because more than one Dept has a pending status.

I have used a variety of COUNT and IF and SWITCH and I can get the pieces but then I lose the connection to the Dept information. I think I need a VAR and a FILTER but I can't figure it out.

Any help is appreciated!