"System Extension Install Failed" from .pkg install

Hi there, I just installed Tailscale 1.74.0 from the pkgs page: https://pkgs.tailscale.com/stable/#macos

I did have a previous installation on this same laptop that was removed a while ago, and this is a fresh installation.

With this fresh install, my Tailscale won’t start up properly, and is flickering with an error message from the menubar icon.
I captured a small video here: https://youtu.be/hG1VyzL7Fso

There aren’t any notices in System Settings > Privacy & Security about allowing Tailscale to install its extension, per this help page: Authorizing the Tailscale system extension on macOS · Tailscale Docs

Is there anything else I can check to try to make my Tailscale healthy, so that I can connect?
I’m on an Apple M1 Pro MacBook.