I've had this same issue. My TV provider is DirecTVNOW and I'm using an AppleTV. I tried solving it on my own for about a week until I happened upon this support community. After I read several of the other replies, I contacted the AMC support center (You can only reach them via email) here: amcpremiere@amc.com . They got back to me within 24 hours. Here's their reply:
"Thank you for the additional information. We apologize your AMC Premiere service has been impacted by a technical problem which we are working quickly to resolve.
We appreciate your patience as we work through this issue, and to make it up to you, we are sending you an Apple iTunes/App Store electronic gift card for two months of AMC Premiere to express our gratitude for being an AMC Premiere customer. (This will be delivered by email, from the sender address <just_for_you@giftcards.apple.com>)
We are very sorry you have been impacted by this. We will be back in touch when this problem is resolved, and are confident that you can begin enjoying AMC Premiere soon. Thank you.
AMC Premiere Customer Support Desk"