To ensure a fair and equitable KCS lockup program for all of our users, KuCoin will prohibit the use of API to withdraw KCS to the LOCKKCS lockup address. This has taken effect immediately and will continue through the end of the lockup period.
Source: https://www.kucoin.com/news/en-kucoin-will-prohibit-the-use-of-api-to-withdraw-kcs-to-lockkcs