Retainers Bug: Impossible to hire a single retainer... Fix please!

Time: 11:38 GMT
Frequency: Every time I try to hire a retainer
World name: Cerberus
Character name: Famran Bunansa
NPC name: All three npc in charge of hiring retainer
Class/Level: PLD 50
Party or solo: Solo
In-game time: n/a
Area and coordinates: Ul'Dah Gridania and Limsa Lominsa
Steps:

1. I talk to Frydwyb in Limsa, I have no retainer
2. I try to hire a retainer, Frydwyb tells me in cannot hire more than 0 retainers, that I do not have any retainer and therefore I've already the maximal amount of retainers at my service

Connection Specs
- Type of internet connection/provider Free (PPPoe)
- Modem maker/model number Freebox

Model Number of the PlayStation®4 You Are Using
- Model Number: n/a