I am having the same problem, I keep getting 90002 on this character, but my other characters can log in fine. I tried using a different PC, a freshly installed FFXIV client, reset router / change DNS and still don't work. The only way I can log in this character is if I data center travel and log in on a different DC, but as soon as I go back to Primal, Behemoth, I get kicked out with 90002 error.

Date & Time: 1/11/2023
Frequency: Since 1/10/2023
World name: Behemoth
Character name: Tony Tiger

Steps:
1. Reset router and restarted computer.
2. Visited another world, received 90002...