I seemed to get IP WHITELIST VIOLATION on Bittrex account for some reason. I tried everything and tried looking for a solution everywhere but couldn't find it at all.
While going through my User activity, it struck me and I found the solution.
So your IPV4 address on your Network settings is not the one that needs to be added. It might differ from your current IP esp. if it's dynamic....
Go to settings >> Summary Page >>> User activity (Last 100 Entries) There you'll find your IP address. Enter that and you'll get Whitelisted.
Hope this helps