Unable to acquire Maiden Phantom Gem or enter battlefield

[Glowee]

Operating System:
Windows 11

ISP:
Private

Type of Internet Connection:
Fiber

Internet Connection Speed:
Gbit

Date & Time:
Ongoing

Frequency:
Always

Character Name:
Glowee

Race:
Hume F

World:
Asura

Main Job:
GEO

Support Job:
WHM

Area and Coordinates:
Selbina H-7 / Nor. Sand J-7

Party or Solo:
Party and Solo

NPC Name:
Veridical Conflux / Trisvain

Monster Name:
None

Steps:
I'm not in possession of the temporary key item "Maiden Phantom Gem", nor am I given the option to acquire it from the HTMB gem vendor. When I attempt to enter the Conflux the portal in Selbina doesn't give battlefield options, it just tells me that "There appears to be a tear in the fabric of space". I've cleared the battlefield dozens (hundreds) of times before, so I'm almost certain I have access.