I have paide for MLB Extra Innings on Xfinity. The instructions on Xfinity to link your Xfinity MLB extra innings package to MLB TV say you must link to a MLB account by following the link to an mlb page where you select xfinity as a provider and then sign in using your xfinity id and passord. However, when you select xfinity on that page, it takes you to an xfnity marketing page to buy extra innings. Any workaround?
Same thing happened to me. After talking with an Xfinity person who couldn't help (she admitted after I was on the line with her for about 30 minutes that she worked in billing not technical services), I called mlb.tv (866-800-1275). I spoke with two women on the first day, who also couldn't help but the second one said this was a known problem on their end and it was "escalated to priority level". I called again the next day, and after speaking with one man and expressing my displeasure, I was transferred to a supervisor. I told him I was unhappy with not getting everything I'd paid for, and somehow he activated my mlb.tv account. So if you pester them enough, they may do the same for you.