@parishollow interesting I may move it to Kucoin - I was looking into the Niffler wallet to store GRIN but haven't tested it. I also have iphone 8 and I'm using a VPN ... saws videos that said sender & receiver have to have a direct contact to send & receive GRIN so wondering if my VPN confused the handoff. I think firewalls & port forwarding can interupt the handoff so I may go back and test the smallest amount of GRIN with my VPN off as I would rather not leave it on an exchange. Are you using VPN also by chance ? Glad Poloniex redeposited your coins

I had the exact same problem. See my response on Parishollow's thread. Hope that helps.

Andrew, contact poloniex support on their page. I had the same EXACT problem a few days ago and poloniex told me that Vite Wallet does not support http withdrawal at this time (even though Vite provided me with an http withdrawal address ...IDK) and they/Poloniex redeposited my GRIN to poloniex. Great except I'm not sure where to send it now. Give that a try - good luck.