Error message trying to use xfinity to authenticate with Max (HBO)

This happens in a Chrome browser. I am logged into xfinity with the primary account. I go to max.com and select to sign in and use xfinity as "connect your provider". It shows a screen that says it has been successful but then ends in a screen that shows the following JSON object: 

{

• response: "failure",
• code: 5116,
• status: 401,
• detail: "unauthorizedInvalid authentication response from Synacor",
• locale: "en-US",
• title: "Partner Authentication error",
• message: "Unable to complete partner authentication process. Please contact support."

}

What is the solution to this? How can I sign into Max?