Native Segwit Addresses aren't supported by the wallets Joe and Bill Gator use. I suggest you try to make a P2SH Nested Segwit address for now till the issue is solved (or native becomes the "norm" enough for more wallets to support it)
This is something I am looking to remedy for future rounds.
I'm open to suggestions, but I'm thinking I will probably just use my Electrum wallet for Native SegWit addresses. I believe I can transfer from Core to Electrum, so that's probably what I'll do so that we don't discourage SegWit usage. I suppose I don't even need to transfer it over to Electrum, could just send it directly from Core to the Native SegWit addresses of participants. It's something I'm perfectly willing and happy to do for participants. I just had a bit of a brain hiccup when it came time to send the winnings at the end of last round, because I was in quite a rush and didn't have time to consider the solutions.
There are no Nested SegWit wallets/clients that offer compatibility with Native SegWit addresses that I know of; is there such a thing currently? There might be technical complications that I'm failing to consider that make this impossible for now.