Yubico and the open_device_failed

Marat Saytakov
1 min readJan 7, 2020


TL;DR: Restart your Mac.

Software develoment, year 2020:

YubiKey Manager open_device_failed

I inserted YubiKey into USB-C on my MacBook Pro 15" 2016, then downloaded YubiKey Manager, opened Application → OTP, and got open_device_failed error. Googled, only found its source code.

Then I decided to restart my Mac, and that was the solution.