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Seems as poloniex has disabled sbd as a currency in the exchange, probably due to the new HF19 update.

To people like me that have used poloniex since day one I recomend having a look at block trades (which has no fees) it is a way better solution to get steem/sbd converted to BTC and doesn't eat up anything in transactional fees.

Not to mention that

Coin Marketplace

STEEM 0.15
TRX 0.16
JST 0.028
BTC 67807.24
ETH 2423.65
USDT 1.00
SBD 2.33