Hey folks, I've updated the main post with the latest news:
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Update @ 16:30 Game Time, March 11th
Following our notice yesterday, we have disabled access for a small number of RuneScape accounts as part of the Login Lockout.
If you are part of this group, you should now see an error message "Invalid email or password" or "Single Sign on fail" when trying to log in.
We will keep you updated as we move forward to our next test phase. Thank you for your understanding.