As per this announcement, ZBT is delisted from Bitfinex, ceasing trading on 18/06/21 at 12:00 PM UTC.
ZB (ZBT) manages a network that includes digital assets exchanges, wallet services, capital venture arms, research institutes and media. It is a cryptocurrency token operating on the Ethereum blockchain.
Trading of ZB is limited to KYC verified customers, at least an Intermediate level required, and certain jurisdictions.
To verify, traders can redirect to bitfinex.com/verification