What does the withdrawal failure or rejection message say? Did you check your email for more explanation why your transaction was rejected?
Nothing. The email only says that the withdrawal was refused without giving any explanation.
This might have nothing to do with the withdrawal address belonging to a gambling site as others have hinted because you did the same withdrawal attempt with a Coinbase address and it was also rejected. If it is about the hold time that DaveF mentioned, then they should've just pointed that out instead of asking for proofs that the address you're withdrawing funds to is the right one and indeed yours. This is the one that made me really curious. Normally, exchanges don't care whether the withdrawal address you're putting is the right or wrong one or whether that belongs to your or not. For as long as it's a valid address, the transaction would proceed.
Exactly! That's what I think too. I don't understand their curiosity to know if the destination address belongs to me or not. The way I see it, it's a really weird thing, never happened with other exchanges.
Yesterday, after posting here, another withdrawal was refused. Chat support told me they needed a screenshot of the full FreeBitco.in address, as it was cropped, not whole, in the previous screenshot. I took the screenshot with the full address clearly visible from the FreeBitco.in site and attached it via chat. They replied that everything should be fine now and that they would contact me "to give me further instructions". And that the withdrawals would remain limited until their contact. I do not understand. My account is verified (stage 1 and 2). With stage 2 I can withdraw up to $ 10,000 per day. I would love to know what the problem is. The only thing that comes to my mind is that I am a new user and they want to wait a few days before authorizing withdrawals. I can't think of anything else.
@sheenshane
No, all withdrawal FROM CEX.IO were rejected. Please, read carefully.
Thank you all for your comments and help.