When you first visit TinyPilot over HTTPS, you'll see a privacy error like this:
This error is expected because TinyPilot secures the HTTPS connection using a key that your system doesn't know about yet.
You can ignore the privacy error, but the better fix is to prevent it in the first place.
To tell your system to trust the TinyPilot HTTPS connection, download TinyPilot's root certificate from:
This is a secure certificate, unique to your device.
To accept the certificate, install it to the trusted root store for your operating system: