Alot of people are wrong here. @Juggles and @IDontEB are correct about the residential ip's,but if you are lucky some datacenter proxies will work too.
After last weeks update,they implemented new kind of locking which destroyed 95% of all datacenter proxies.
The locking issue is something that is getting triggered by the client.I hope @Alek will take this serious and look into it.there are multiple clients that are having this issue.