I've seen this issue, EX: even when you first activate the husband's phone and purchase the app, then setup the wife's phone (on the same Apple ID) it will often prompt thru the purchase of the app again. Most of the time it does not actually charge the account (in the early days of the APP, it was a disaster). I just tell the client to check to make sure that they weren't charged a second time...
NOTE:? The Phone GO app and the Tablet GO app are separate purchases on any one Apple ID (i.e. $ 100 x $ 100 = $ 200.00)
The whole thing was completely misguided in its design...
