It's unfortunate having to sign into the VPN with your username and password for the VPN - for some of my devices I'm using Windows or Android, where I don't consider the operating system secure.

Users should have the ability to sign into Proton VPN with single sign on from a trusted device.

For instance, I'm using Linux and GrapheneOS for relatively secure environments, but I'd still like to be able to sign into Proton VPN on Windows, for instance, without having to type in my entire email and password - Windows itself has been proven to track what you're typing. Using MFA for Proton helps mitigate the risk of this but it's unfortunate to have to rely on this