If you have an IP address that is dynamic (changing), then you will be unable to authorize your proxies via IP authorization in the proxy dashboard. You will need to instead use Username/Password authorization.
However, it is not currently possible to use Username/Password with our Rotating Proxies, only IP authorization. So if you have a dynamic IP, then rotating proxies will not work for you.
If you are still experiencing issues please send us a support ticket HERE.