How do I troubleshoot DNFS configuration issues?

I'm trying to enable DNFS on a test server, to check out using Azure NetApps as a file system, but am running into issues.

It's Oracle EE 19.20 Single Instance DB on Oracle Linux 7.9 (on an Azure VM from an Oracle Linux image). DNFS is enabled by the make -f ins_rdbms.mk dnfs_on command

I've got my mount point set on the server

10.170.103.5:/nfsv4  /u07_nfs nfs  rw,bg,hard,rsize=32768,wsize=32768,nfsvers=4,timeo=600,actimeo=0,tcp,addr=10.170.103.5 0 2

My $ORACLE_HOME/dbs/oranfstab has the following

server: az-nfs
local: 10.170.102.7
path: 10.170.103.5
export: /nfsv4 mount: /u07_nfs

When I start the db I see both