BartinVA last edited by
Are security keys like Yubico compatable with Vivaldi?
@bartinva I can't confirm personally but it looks like it should. I searched the bug tracker for yubico and yubikey: past issues have either been resolved or could not be reproduced, so that looks promising. That said, I'll double-check with the QA team and internal testers to see if any of them are currently using it on macOS.
Please check with Mac.
On Windows and Linux Yubikey 5 NFC and Security Key works for me at https://demo.yubico.com