Hmm, maybe I don’t understand how to generate the pairing phrase using lnc. I thought you could find the pairing phrase in LND, and use the aezeed cipher seed?
We did one a while ago, here it is
https://www.youtube.com/watch?v=r8JC4gNlObY
What is the issue you are seeing?
Discussion
You need to Install and run Lightning Terminal Daemon (litd) on your node.
Once you have litd, then you can use Lightning Node Connect (LNC) to generate a pairing phrase.
More info in the LND docs here - https://docs.lightning.engineering/lightning-network-tools/lightning-terminal/lightning-node-connect