I had this issue as well, and I'm not sure how long ago this was posted, but I resolved this by chatting with YouTube TV and getting the resolution from them. So, to outline this for others who don't want to go through that process, simply go to Google Payments (YouTube is part of Google). Log in to your Google account and go to your payment methods. You will see your PayPal account there, listed as closed, as mine was. My PayPal account is not closed, but I assume that it got disconnected from Google at some point. I simply removed it there and then added it back when I went back through the sign up process with YouTube TV. I am not sure if there was a "Fix This" link with the payment. There may have been, but for me, it was easier just to remove it and add it back.
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