Constraint missing_drivers error when using sidecar_service

I am trying to set up a service to use a sidecar service, but whenever I add the sidecar_service stanza to my job specification, I get an error:

Constraint missing drivers filtered 3 nodes

I have installed the cni plugins as described in the documentation. I have confirmed that my available nodes have the CNI plugin executables in /opt/cni/bin. I have also tried to run the exact sample job specification contained in the Nomad documentation, and I got the same results.

Is there something else I need to do before enabling the sidecar_service within my configuration?