Any idea mainnet token swap to erc20?

I think it is totally blocked mainnet token swap to erc20. anyone know how to figure out this problem?

I really do not understand why Mainnet to ERC-20 token swap open for 2 weeks every 2 months. only upbit exchange support mainnet token. Have you guys seen upbit price of NKN? -30% lower than other exchange. It is really big problem.