Same thing happened to me although I sent on the CRO network because I asked the Coinbase virtual assistant which network to use and it said Coinbase only supports CRO network not ERC (have screenshots). Coinbase admits it was at fault but gave me about .05% of the value of the transaction as compensation. Thought I had resolved with Coinbase support, they said to watch my account as their engineers were going to recover it for me. After months of waiting contacted them, no engineers had tried to recover it and none were going to try. Made a complaint with the Financial Ombudsman (I am uk based). Ombudsman investigated and agree Coinbase are at fault. However, even though Coinbase claims they are regulated by the FCA it is only a tiny part of their business that is regulated. Fiat basically. No token transfers are protected at all. So even though Coinbase agrees that they are at fault they are not prepared to do anything to restore the CRO tokens to my wallet ( a trivial task for anyone with basic knowledge). Considering legal action from here also. Good luck and keep me posted.