Family Sharing Ask to Buy Not Working (with exact explanation)

Question

I see lots of posts on this, so I will try to be very specific in hopes someone can solve this and others can learn from it too.
My family has 4 iPhones: my iPhone 6; my sons' two iPhone 6 Plus iPhones; and my daughter's iPhone 5S. All are running the latest iOS 8 (8.0.2).
I cannot seem to get any of my kids iPhones, with all of us on Family Sharing, to send a request to my iPhone for purchases they want to make. Despite what I believe is the correct setup for Family Sharing, they get asked for the security code of my credit card. I will go through the setup and steps in painstaking detail in hopes this helps:
In Settings > iCloud > Family I have myself as the "Organizer" and my 3 kids, with the "accounts" as follows:
Me = the regular iTunes account I have had for years
Son #1 = @icloud iTunes account I made on his iPhone with the new process for minors
Son #2 = ditto above, except for this son
Daughter = ditto above, except for my daughter
"Ask to Buy" is turned on for all 3 of my kids accounts
In iTunes & App Store on my iPhone 6 the Apple ID is indeed my Apple ID
In each of my kids' iPhones, in Settings > iCloud, it shows the same @icloud account as mentioned above. In other words, each of them have as their iCloud account the same ID as what I see in the Family Sharing on my iPhone.
Similarly in each of my kids' iPhones, in Settings > iTunes & App Store, the Apple ID is the same @icloud account for that respective kid's iPhone.
When I go to make a purchase on any of my kids' iPhones, here's exactly what happens…the example being to buy the movie Godzilla
Videos > Store > Search > "Godzilla" > "$19.99 BUY" > "BUY MOVIE" … up comes the "Sign In to iTunes Store" box that asks "Enter the Apple ID password for the [email protected]" (correct ID for that phone) … I enter the correct password for that kid's account … and then get the "Payment Verification Required" which says "Your Family Organizer, <my correct iTunes account> must enter the security code for the payment method." … I then press Continue and this is where it really surprises me … instead of sending any request to my iPhone (I get nothing) it brings up "Account Settings" and asks for the Security Code for my credit card. What the heck? Shouldn't this instead trigger a request to my iPhone? At this point there's no way to proceed. If I hit Cancel it exits out. If I hit Done (without entering the credit card security code) I get the notice "Confirmation Required" which says "Do you still want to buy Godzilla (2014) for $19.99?" … if I say Continue, I get the very same "Payment Verification Required" as mentioned above, which returns me again to the page asking for the credit card security code, essentially an endless loop.
Help! I am hoping someone knows how to solve this problem (and that this post helps others with similar problems).
Thanks for any help!

Answer 1

Thank you Ms. SJ!!!!
I was having this problem with my youngest daughters account.  Your post about establishing the payment history apart from family sharing made a lot of sense.  My oldest daughter has had an account for some time that she had been adding iTunes gift cards to, so her account was "established" before it was added to our family sharing group.  I had no trouble approving her purchases. 
I had set up an account for my youngest daughter a long time ago, but used it only for email and iMessage on her iPod.  My ID was used for purchases on the device.  After Family sharing was launched and she got an iPad for Christmas, I decided to set up her ID as the primary account on her new iPad and added her to family sharing. 
The first problem I ran into with Family Sharing was enabling the "Ask to Buy" function because since I set up accounts for my daughters a long time ago they were both showing as adults.  I learned from another post that the fix for this was to change their birthdates to January 1, 2001.  I did this and it has them listed as Age 14 on their family sharing profiles - fine. 
I then ran into the same problem with Ask to Buy that David Wilkie described above.  My fix was a little different from yours and less intensive. 
Removed my youngest daughter from family sharing
Purchased an app using her account alone (with an iTunes gift card attached) to establish a purchase history.
I then re-added her to our family sharing group. 
I had her purchase a song using "Ask to Buy" and it worked as expected. 
Thanks for going through the legwork with support to find this fix and share it.  I hope my experience can be helpful as well.