I got the same error last night, even though my last login on May was succesful. I follow Midsommar suggestions in this thread ( change password, do a clean re-installation, vpn, I even use the command "connect ip port" for silver as for the suggestion in another similar thread). The issue happens to me only in the silver server, I can connect on my account on the gold server though ( I don't play that server but they asked to start from scratch).
My attempts to access to silver was first on my pc then on my phone same results. In my phone I tried using my wifi then I used my data, same result. Unfortunately, I couldn't test it on friends as there are busy righ now.
The RTT that shows in my client was around 100-ish, I even ping the server even though I knew it was up ( I used the command ^up in discord), and threw me response. Is there any way I can verbose or showed me the complete message why is failing? ( cause login failed is pretty broad). I can do another attempted on the night to see if I can access. I appreciate any insight