Symbol has monthly klines, but REST API does not return them

Hello,

Symbol IOSTBNB has monthly kline data: https://data.binance.vision/data/spot/monthly/klines/IOSTBNB/1mo/IOSTBNB-1mo-2020-01.zip

But a query to the REST API states symbol is invalid: https://api.binance.com/api/v3/klines?interval=1M&startTime=1577836800000&limit=1&symbol=IOSTBNB

Also, a query to REST API exchangeInfo does not show the symbol either way: https://api.binance.com/api/v3/exchangeInfo

Is this expected behavior? Should I use a different endpoint?

This symbol is delisted.

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