Tailscale Exit Node/Subnet Routers

Hi, I am running the pretty much default Tailscale configuration, with the following two parameters set. (See Screenshot) But unfortunately it doesn't seem to work. In the Tailscale panel I get the following error message: Unable to relay traffic This machine has IP forwarding disabled and cannot relay traffic. Please enable IP forwarding on this machine (https://tailscale.com/kb/1104/enable-ip-forwarding) to use relay features like subnets or exit nodes.

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Subnet routers · Tailscale Docs

Use subnet routers to give devices outside your local network access to services within specific subnets. Extend your private network with Tailscale.