# Nitrokey 3C NFC fails generating key or unlocking when used on a different VM than sys-usb
**URL:** https://support.nitrokey.com/t/nitrokey-3c-nfc-fails-generating-key-or-unlocking-when-used-on-a-different-vm-than-sys-usb/7521
**Category:** FIDO2 / Nitrokey 3
**Created:** [March 13, 2026, 7:09am UTC](https://support.nitrokey.com/t/nitrokey-3c-nfc-fails-generating-key-or-unlocking-when-used-on-a-different-vm-than-sys-usb/7521 "2026-03-13T07:09:51Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@gasull](https://support.nitrokey.com/u/gasull)
#### Post date: [March 13, 2026, 7:09am UTC](https://support.nitrokey.com/t/nitrokey-3c-nfc-fails-generating-key-or-unlocking-when-used-on-a-different-vm-than-sys-usb/7521/1 "2026-03-13T07:09:51Z")
Please help me debug this.
I’m trying to use [https://confer.to](https://confer.to) in an AppVM in Qubes OS with Brave Browser.
I can only make it work on sys-usb.
When I try to use it in another VM, I connect to Confer.to with Brave Browser, Nitrokey 3C starts bliking blue, and after I touch it, I get this message:
```
Your device can’t be used with this site
confer.to might require a newer or different kind of device
```
---
### Author:  [@alexandre](https://support.nitrokey.com/u/alexandre)
#### Post date: [March 13, 2026, 12:03pm UTC](https://support.nitrokey.com/t/nitrokey-3c-nfc-fails-generating-key-or-unlocking-when-used-on-a-different-vm-than-sys-usb/7521/2 "2026-03-13T12:03:54Z")
Hello, I just tried on QubesOS and it works when my NK3 is attached to the qube.
On your same qube are you able to make your Nitrokey work with [https://webauthn.io/](https://webauthn.io/) ?
Additionally what is your Nitrokey firmware version?
---
### Author:  [@gasull](https://support.nitrokey.com/u/gasull)
#### Post date: [March 16, 2026, 3:53am UTC](https://support.nitrokey.com/t/nitrokey-3c-nfc-fails-generating-key-or-unlocking-when-used-on-a-different-vm-than-sys-usb/7521/3 "2026-03-16T03:53:32Z")
It’s working now. I’m not sure why it didn’t work earlier.
Thank you!