Check Authenticator is active
To check if RuneScape Authenticator is active and protecting your account, access the lobby to see if you can see a tick on the Authenticator icon:
The authenticator icon will show a tick when it's active
If you play Old School RuneScape or would like to check from the website, you can also check the Authenticator tab of your account management settings.
A good time to check that the Authenticator is still active is when you update your password.