Can I get local news channels with a paid app? Help!

 I decided to try streaming finally. It has been totally a disaster with xfinity customer service every step of the way. Having no local news is why I put it off so long.  So I thought xfinity stream as an add on would help me get news. For 39.95 . So i go to the flex app and  it walks me thru the process of signing up , completes and tells me to continue watching flex while it updates my account. Nothing happens....... at all. So, I chat with xfinity this AM, and  here we go- she says If I want xfinity stream, I have to DE-ACTIVATE my flex boxes and just use xfinity stream. Now why would flex walk me thru a process to add it  if I have to deactivate flex? I told her I really thought she was completely wrong. All I want to do is pay to add on local news channels to my xfinity flex without paying 70 to 100 a month!  Can someone give me a simple answer?