I have requested a withdrawal.

And received a response :

We have sent 0.01857310 BTC to: Bitcoin, ***, 1QJYU1onDdZdifz6yK3SbWymE9mJdXenaX.
Withdrawal transaction: f921fbb8f681eef7bca3f841307f45e6522985c3682df09dee53f92772389e53

But as you can see the transaction does not even exists.

What is going on here ?