# Nitrokey U2F issues in macOS 10.12.4
**URL:** https://support.nitrokey.com/t/nitrokey-u2f-issues-in-macos-10-12-4/444
**Category:** Misc
**Created:** [April 29, 2017, 11:29am UTC](https://support.nitrokey.com/t/nitrokey-u2f-issues-in-macos-10-12-4/444 "2017-04-29T11:29:43Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@dchest](https://support.nitrokey.com/u/dchest)
#### Post date: [April 29, 2017, 11:29am UTC](https://support.nitrokey.com/t/nitrokey-u2f-issues-in-macos-10-12-4/444/1 "2017-04-29T11:29:43Z")
Hello,
I can’t normally use Nitrokey U2F for some time on macOS 10.12. Nothing happens when I plug in, I can’t register or login with it in Chrome. I have two keys, neither works, so the problem is probably with macOS.
Console output:
```auto
default 13:18:55.729875 +0200 icdd #ICDebug - 23:{ICWiredBrowser.m} (USB Device first match)
default 13:18:55.731320 +0200 icdd #ICDebug - 388:{ICWiredBrowser.m} (3 USB Descriptions Managed)
default 13:18:55.734018 +0200 icdd #ICDebug - 37:{ICWiredBrowser.m} (USB Interface first match)
default 13:18:55.734913 +0200 icdd #ICDebug - 388:{ICWiredBrowser.m} (4 USB Descriptions Managed)
default 13:19:11.195823 +0200 kernel 000133.248250 IOUSBHostHIDDevice: IOUSBHostHIDDevice::start: unable to start IOHIDDevice
```
The curious thing is that when I do the following:
1. Go to a website that requires U2F and try authenticating.
2. When asked for key, plug Nitrokey U2F.
3. After plugging Nitrokey, plug some other device — e.g. a USD drive into another USB port.
4. Nitrokey works and authentication succeeds.
This “workaround” only works if I plug the USD drive, but not when it kept plugged.
System: MacBook Pro (Retina, 13-inch, Mid 2014), 2.6 GHz Intel Core i5, 8 GB 1600 MHz DDR3, Intel Iris 1536 MB.
OS: 10.12.4 (16E195)
Any suggestions?
Thanks!
---
### Author:  [@jan](https://support.nitrokey.com/u/jan)
#### Post date: [August 3, 2017, 7:51pm UTC](https://support.nitrokey.com/t/nitrokey-u2f-issues-in-macos-10-12-4/444/2 "2017-08-03T19:51:34Z")
We are currently developing a new FIDO U2F device which shouldn’t have such issue.