game center unlock achievements when using groups

I’ve got the paid and free versions of my app set up to use the same game center leaderboards and achievements using the group feature. (No need to enter them multiple time)

On my sandbox account GC logs in fine but the achievement listener event.data table appears to be empty and the achievements never show up in GC.

Does anyone know what the correct format is for submitting a group based achievement. (The achievement IDs in itunesconnect always start with grp.)
I’ve tried several different formats.
[lua]
– just the id name
gameCentre:unlockAchievement( “combo_05”,100,true, gclistener )
– with the grp
gameCentre:unlockAchievement( “grp.combo_05”,100,true, gclistener )
– with the grp using the game’s bundleid
gameCentre:unlockAchievement( “com.wideawakegames.monstermarathon.grp.combo_05”,100,true, gclistener )
– bundle id without the .grp
gameCentre:unlockAchievement( “com.wideawakegames.monstermarathon.combo_05”,100,true, gclistener )
– just the group identifier in itunes and the achievement id
gameCentre:unlockAchievement( “monstermarathon.grp.combo_05”,100,true, gclistener )
– just the group identifier in itunes and the achievement id without the .grp
gameCentre:unlockAchievement( “monstermarathon.combo_05”,100,true, gclistener )
[/lua] [import]uid: 9035 topic_id: 37488 reply_id: 67488[/import]

This one works, but the achievement string is case sensitive !!!

[lua]
– with the grp
gameCentre:unlockAchievement( “grp.combo_05”,100,true, gclistener )
>/lua> [import]uid: 9035 topic_id: 37488 reply_id: 145729[/import]

This one works, but the achievement string is case sensitive !!!

[lua]
– with the grp
gameCentre:unlockAchievement( “grp.combo_05”,100,true, gclistener )
>/lua> [import]uid: 9035 topic_id: 37488 reply_id: 145729[/import]