Xfinity Prepaid Virtual MasterCard

I received an email with a $50 virtual prepaid MasterCard that I wasn't expect. The email doesn't state why I am receiving this card.  I am reluctant to click on anything in the email without verifying whether the offer is valid and originated from Xfinity. I checked the Xfinity site (including my account notifications) but don't see anything helpful. Please let me know if you can assist, and thanks for your help!