Rinse Agent Dispenser Not Working

All of sudden, there’s scum on dishes etc. Suspected rinse agent not dispensing when I tried one of those all-in-one detergent tablets, that includes rinse agent and dishes look good. I disassembled door assy and it appears that the actuating arm that opens soap door, should also simultaneously actuate the rinse agent plunger. There appears to be something missing, as actuator arm doesn’t move this plunger at all. Not sure where this part could have gone and the pictorials on site aren’t detailed enough for me to tell what this clip or link looks like. Another alternative…maybe the rinse agent isn’t supposed to be linked to the actuator for soap dispenser…appeciate your assistance w/this, thanks in advance.