Importing User Error: 500 - Internal Server Error Invalid RPC response

Part 2:

I went and deleted all the previous system accounts for omvnfs (975). Then recreated them using regular user accounts as UID/GID 59975/59975.

Went into OMV and imported omvnfs user. It gave me the red box which said User 59975 already exists but the user omvnfs showed up in the list but with group users instead of group omvnfs (59975). So then went into Groups and group omvnfs was there but showed no members. Added as member, omvnfs. Click Save and got the 500 - Internal Server Error.

Here's the state it left things:

pi@raspberrypi-nas:~ $ sudo getent passwd | sort -t: -k 3 -n | grep omvnfs
omvnfs:x:59975:100::/home/omvnfs:/bin/bash
pi@raspberrypi-nas:~ $
pi@raspberrypi-nas:~ $ sudo getent group | sort -t: -k 3 -n | grep omvnfs
omvnfs:x:59975:omvnfs

Looks like it didn't add the group.

This is what things looked like before I imported omvnfs in OMV:

pi@raspberrypi-nas:~ $ sudo getent passwd | sort -t: -k 3 -n | grep omvnfs
omvnfs:x:59975:59975::/home/omvnfs:/bin/bash
pi@raspberrypi-nas:~ $
pi@raspberrypi-nas:~ $ sudo getent group | sort -t: -k 3 -n | grep omvnfs
omvnfs:x:59975:

Here's the line I used to import the user omvnfs:

omvnfs;59975;OMV NFS user;;;/bin/bash;omvnfs;n