Ok i seem to have gotten it working. In the nginx config on the jitsi server, I commented everything from this line:
location^~ /.well-known/acme-challenge/ {
to this line:
ssl_certificate_key /etc/jitsi/meet/sub.domain.com.key;
which effectively removes the server block listening on port 4444, then moves all of the location blocks and config from the listen 4444 server block to the listen 80 server block.