The upgrade we recently preformed was a complete switch to a brand new server. What this means is most peoples login tokens have been invalidated. If you have switched to our SSO the account server will automatically refresh that token or you will have to press login and it will create a new one for you.
If you have not created an account on our SSO system though you will now have to create one to regain access. Instructions on doing this can be found here:
If you have any issues or require assistance please email firstname.lastname@example.org or contact me on discord. Thank you for your understanding.