Tailscale has partnered with @mullvadnet to make its high-speed global network of servers available as exit nodes. Bring a trusted name in privacy and security right to your tailnet—now in beta https://tailscale.com/blog/mullvad-integration
Mullvad on Tailscale: Privately browse the web

Tailscale has partnered with Mullvad to make its global network of VPN servers available for our customers. You can now easily browse the web using any one of Mullvad’s available servers as a Tailscale exit node while maintaining the user privacy that’s synonymous with Mullvad. Mullvad is a Virtual Private Network (VPN) service that’s known for its strong commitment to user privacy, anonymity, and security. This new partnership means that even when you’re far from home, you can stay connected to the things you care about via Tailscale and maintain private internet browsing thanks to Mullvad’s secure and high-speed global network.

Tailscale
@tailscale
Enabled it on my tailnet, following your docs. Don't see any options to select a mullvad exit node on either Mac or Android, both running 1.48.1. ACLs resemble what docs describe... any tips?
@seekingvainly @tailscale do you have tailnet lock enabled?
@aitvaras
@tailscale Yep, I do...guessing the mullvad exit nodes need to be signed too? I can see how that might be an unsupported case on day 1.
@seekingvainly @tailscale yes the lock is preventing nodes to pop up. You could see the nodes and thier node keys if you'd run `tailscale lock status`. Then you could sign the ones you want to use.

@seekingvainly @tailscale

You have Tailnet Lock enabled? Seems Tailnet Lock and Mullvad add-on might not be compatible