[Error 90002] Inability to login to EU Data Centers

[Rueby]

The same here, I even tried it on my laptop and both failed to connect my account. Someone found a solution so far?

The issue seems to be fixed around Chaos, if you wish to play, use the Data Center travel option and take your chaos character and play on Light for now. However, you will lose access to retainers, FC and FC related stuff, Mail, House etc. This is the only current workaround if you just want to login.

Could it be that the german client is mostly affected?

I'm on the EN client and I'm affected, I don't think it's related to the client's language.