I'm away from my computer, but it's just the standard Coinbase account details when you press 'deposit' on your EUR wallet. I copied them over from Coinbase into Revolut and it's now saved as a beneficiary, so it takes seconds to send my Coinbase account more money.
If you've had the e-mail from Coinbase you will have entered the correct details, otherwise they would have just received an anonymous payment. But the Coinbase ID is the reference you get when pressing the 'Deposit' button on your EUR wallet. Strange that it didn't appear instantly once you had the email however.