Can't Accept Quest "Eternal Bond Anniversary"

Date & Time: 15th August 01:32
Frequency: Every single time
World name: Balmung
Character name: Shouta Purr
Retainer name: -
NPC name: Hawu Bajihri
Monster name: -
Class/Level: Scholar lvl 80
Party or solo: Party
In-game time: -
Area and coordinates: East Shrout 17.5 18.4
Housing: -
Steps:
1. Me and my Partner (Vanilla Hibane) Join a Party and both have the Rings Equipped.
2. We both go to the NPC and try to Accept the Quest.
3. My Partner can Accept the Quest without any problems as i can't and get this Reply from the NPC.
https://i.imgur.com/PdO6dv1.png

Connection Specs
- Type of internet connection/provider: Cabel, Telekom (Germany)
- Modem maker/model number: -