So do I have a chance now to withdraw the funds successfully without approving it?
Time will tell but I think chances of getting your money back are so low. Isn't the coinbase vault feature like Multisig wallets but this time instead of private keys, email addresses are used to approve transactions?
If yes, then I don't think they might help you but let's wait after 72 hours and see. The rules involving multisigs or in this case coinbase vault are pretty much clear. No approval, No transaction.
As you said nothing changed after 72 hours, the transaction stays still pending and waiting for the approval.
But coinbase replied to my another support a week earlier to complete KYC and get verified to help me to change the approval email from their side.But I completed as they asked but after that there is no reply to that ticket, surprisingly I received an response like
Hello xxxx,
That's the end of the response, but they are supposed to change the email right. I am kind of annoyed with their support again that is why I left the funds even if worth few hundred dollars earlier this year.