VPP redeemable codes error when install

Hi,


I have a B2B app distribute with redeemable codes and works well with many iphones. But some ones is getting this error messagem "I cant connect in Itunes Store"
Anyone did have this problem already? How I can explain to this users solve or avoid this problem. Please, see the video bellow


https://www.dropbox.com/s/w6o1eh6w5tgrsyi/apple-b2b-error.mp4?dl=0


Thanks a lot