Hi MopishSauce 70
Seems like a lot of people have problems activating those free trial. You can wait and see if it works for you later or contact customer support by phone and they may be able to help you out.
Toll free: (800) 4MY-XBOX or (800) 469-9269
Hearing impaired (TDD device): (866) 740-9269 or (425) 635-7102
Xbox hours of operation:
9 am to 1 am Eastern Time
6 am to 10 pm Pacific Time