xfinity now

Hello, I'm having issues activating my Xfinity Now equipment with my Xfinity login.  I had an active Xfinity account when I signed up for Now at the same address.  I looked up my email and phone number that I set up the account with and neither was recognized but I did receive an email about the equipment shipping.  When I am logging in, i just get error messages and am told I have no authorization because I'm not a customer. Any help would be appreciated. Thank you.