Cannot progress Sandoria mission 7-1 Prestige of the Papsque

Platform: Windows 7
ISP: Etisalat
Internet connection: DSL
connection speed: 3Mbit/s

Date and time: 12:20 PM (GMT+4) 2 December 2016
Frequency: always

Character name: Hashimi
Race: Hume M
World: Asura
Main Job: BlU 99
sub job: whm 49
Area: West ronfaure (E-8)
Solo

NPC name: ???
Monster name: None (supposed to be Marauder Dvogzog)

Steps:
1. I first accepted the mission several years ago, probably in 2010. I cannot remember if I ever managed to spawn the Notorious Monster at the time.
2. I started playing again last year with the return home to vanadiel campaigns and attempted to complete the mission.
3. I am not able to spawn the Notorious Monster Marauder Dvogzog by clicking on the ??? at (E-8) in west ronfaure, despite several attempts over the last couple of years.
4. I have tried returning to talk to gate guards again.
5. I have tried going to the papal chambers in the cathedral again, where I am given a single line saying that I need to retrieve something from Bostauniex Obliette.
6. I have repeatedly headed through Bostauniex Obliette to get the the ridge in West Ronfaure where I should be able to spawn the quest monster.
7. I have checked several external resources for details on the quest and am unable to find any reason for the NM not to be spawning other than a bug.