Gloria,
Thanks for posting. Do you still have the board you had when these Activotes were purchased? If so, does it appear in your list of hardware in your registration window and can you select it and attempt to register there?
The model Activote you listed is not compatible with the model of Activhub you listed- they operate on different radio frequencies. Most users of the AV2 votes registered them through their AC2 Activboards. If you still have the original board, you should still be able to register, however if you only have the AH2 hub you will not.
One other note, do you know whether you got another piece of hardware along with that AH2 hub, like an Activslate? Your software should be able to register if you have an older board connected, but outside of registration the software wouldn't be able to see the Activotes- disconnect the hub (And possibly restart the software) and you should be good.
Please let us know what equipment you have and we'll assist further as we're able. I've logged against case 354169 if you need to contact us directly. Thank you,