If you're experiencing issues with Yubikey authentication, please bear in mind that Rambox currently does not fully support Yubikey on macOS and certain Linux distributions sadly.
This limitation is due to our reliance on Electron, the framework we use to build Rambox, which does not yet provide full support for Yubikey on these platforms. However, our Yubikey options work properly on Windows, where you can easily authenticate using your device.
We apologize for this inconvenience and want to assure you that we are always looking to improve. We will continue to investigate this matter and hope to provide full Yubikey support across all platforms in the future.