I notice that I'm not getting the options for the ZFS repos in the omv-extras system group. Not sure why this is. They are present in my other OMV system using an older OMV-Extras package.
I have exactly the same issue on a new build, I'm trying to transfer my Freenas volumes over onto a new Openmedia vault 3 load but it is so not working I'm thinking of going back! I loaded the latest builds for OMV3 and OMVextras, managed to get the zfs icon but the build actually failed and the zfs plugin fails to start, looked like the kernel module is not loaded so went to look for the repos but as @wolfpackmars2 says the repos are no longer there, I am using an AMD64 build.