Can't Seem To Get App Connector Working

I'm trying to use an app connector to have all my local and remote Tailnet machines send just Netflix traffic through the connector and out the WAN interface on my home router.

I followed the steps outlined here: https://tailscale.com/kb/1281/app-connectors

Initially I think everything was configured correctly as the status of the machine showed it was a connector and under the Apps tab (on the Tailscale admin console page) I could see that Netflix domains were listed and the status appeared to show a route advertised (I can't recall exactly what it showed here TBH).

Now, under the machine I see a "Subnets" tag flagged with an exclamation mark. Hovering the mouse over this tells me "This machine is misconfigured and cannot relay traffic. Review this from the “Edit route settings...” option in the machine’s menu."

I then went to "Edit route settings..." and was told that IP forwarding was not enabled. I then followed the steps in the link provided (https://tailscale.com/kb/1019/subnets?tab=linux#enable-ip-forwarding) but I see no change in status and I'm still told I need to enable IP forwarding.

I can confirm IP forwarding is enabled by getting running "sysctl net.ipv4.ip_forward" and receiving "net.ipv4.ip_forward = 1"

I'm confused about what to do next.