Steem withdrawall to POLONIEX has not been credited after 13 hours ! Need help!

A friend transferred a decent amount of STEEM 13 hours ago to Poloniex from here.

I was just asked to look into it.

I cant even see the trasnsaction as pending on poloniex.com but I can see the transfer on poloniex's wallet here on steemit.com.

Address is correct.Memo is correct.

What  could be the problem?

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If the address and memo are correct, then advice your friend to contact Poloniex support to inquite about the transaction and why it is delayed.