I just updated my HBG and realized this problem as well. I however figured out a fix, I founded a modded tinfoil which can use hbg / tinfoil without any anti atmosphere DRM.
Simply follow these steps:
1) Drag and drop HBG onto the root of your sd card.
2) Drag and drop the mod found
here onto your sd card.
3) Drag and drop the latest version of atmosphere or kosmos onto the root of your sd card.
4) Boot into hbg / tinfoil and copy down the device id it gives you.
5) Put your sd card in your computer and go to switch / tinfoil / mod_config.ini and open it.
6) Delete "enter your tag" and replace it with the device id you copied down.
7) Save the file and put your sd card back into your switch.
8) Boot into HBG / Tinfoil and enjoy!
I take no credit for this app or this mod neither were made by me.