I do not handle the server side of things but I spoke with someone in our chatbox who had this issue and resolved it with them. I am making Support aware of the issue to try to get this taken care of in a timely manner. Sorry for the mix up on our end.
Thanks for the answer. Unfortunatelly, people from the server side (I think), have one answer for me"
"Looks like You generated address before official announce. Those addresses are not valid."
They are joking, right?
Offcourse they are joking....
and any solid exchange has a script where the dump the private key of the addresses generated. Incase of any problems the can generate the wallet address again in another wallet on whatever computer.
So don't try to put the blame on us. I know you have access to our coins