There are 3 coins using the ticker symbol ACC.
Accelerator Network (ACC), AdCoin (ACC) and ACChain (ACC).
Each of them is listed on 2 different exchanges (6 in total).
If Accelerator Network (ACC) wants to get listed on CoinExchange, it can't do that under the ticker ACC since AdCoin (ACC) is already listed there.
https://www.coinexchange.io/market/ACCL/BTC but from what I've heard on here their wallet is not working.
Or it could be related to the problem with different tickers ACC & ACCL as mentioned above.