Same issue, tried many times over multiple hours, consistently get 90002 when logging in on my character. Tried to create a new character and that one gets into the game just fine consistently. So either the server managing the place my character was in on logging out (Idyllshire) is broken or some other shenanigans is going on. Although, when using the player search functionality as the newly ccreate char I can see people in Idyllshire so that means it's more likely related to something else...

In before @sweetietreat replies, just because it happens around the same time as a DDoS is no guarantee that it's related. The maintenance just as easily could have introduced this issue. Don't assume, bug reports are always useful. Correlation is not causation.