A Grave Mistake Progression Stopped

I am posting this for my friend (Tann) because he cannot log into the forums.

Platform: PC
ISP: Sonic
Type of Internet Connection: Fiber
Internet Connection Speed: 200/100
Date & Time: Thursday November 23rd, 9:15 PM
Frequency: Once - on-going
Character Name: Tann
Race: Mithra
World: Sylph
Main Job: BLU
Support Job: WHM
Area and Coordinates: Eastern Adoulin (K-9)
Party or Solo: Solo
NPC Name: Ploh Trishbahk
Monster Name: No enemies involved - plot progression.
Steps:
I am currently on the mission A Grave Mistake for Seekers of Adoulin, and am unable to progress.
1. Spoke to Sainene in Rala Waterways and received mission text.
2. Spoke to Stout Weir and received KI 'Broken Fuse'
3. Returned to Ploh Trishbahk at Castle Adoulin and she does not progress the story.

I have an open support ticket that has been unanswered - 7724173
I am unable to log into the FFXI forums with my own email address/SE account - hence this being posted by a friend.