AT&T Call Protect Plus Subscription Question
I just enabled AT&T Call Protect Plus on my phone via iTunes. I'm part of a family and have family sharing enabled. We are also all on the same phone plan. I was able to activate the service on the app on my phone no problem, but when other members in the family download and install it, they just have the basic (free) subscription and it prompts them to pay 3.99/month. I thought that I could share the iTunes purchase with up to 6 people. Am I correct in assuming that I only have to pay for the service one time a month to protect all lines on our plan? If so, how do the other members in my family group activate the plus features after they have downloaded the app?
Thank you for your help!