are you trying to use a vpn? that would be why.
attackers would often use vpns to carry out their attacks and the staff would ban that ip
if you turn it off you should be able to connect
or, in a worser case, your account was compromised and someone used it in 2018 to bot attack. for this you should change your password and then make an appeal
https://manacube.com/appeal/
i recommend changing your password regardless because you should be changing it every 30 ish days to be safest