Xfinity call guard - Receiving error (Your plan option does not include Xfinity Call Guard)

I recently changed my plans to the Premium Unlimited level for two of my three lines.   I downloaded the app and when I try and go thru the setup process, I am receiving an error that states:  Your plan option does not include Xfinity Call Guard. Xfinity Call Guard is only available for customers on select Xfinity Mobile plan options.  I rebooted the phone and deleted and re-downloaded the app but the error remains.  I was advised that this was one of the benefits of upgrading my line to the Premium Unlimited level of service.  Is there a waiting period before this feature is available to me since I switched levels of service in the middle of a month and if not, can someone from Xfinity tech support help me get this resolves so we can use the service on the two Premium Unlimited lines?  Thanks in advance!!