WSFC and Netbackup

I have some question and it complicated

Current setup 1 primary server and 1 netbackup appliance

We actually have 2 server for WSFC setup but some how it wasn't setup

Now that I have been task to do so may I know what are my options?

Redo win 2019 with WSFC and reinstall netbackup but how am I able to connect back the appliance media server to the WSFC netbackup.