how to reconnect to a previously active LUN (ISCSI) with hyperv core

I'm currently using Hyper-V core (2016 and 0219) along with netgear readynas via ISCSI LUNs.  the hyperv's are in workgroups not joined to a domain.

once I present a LUN to one of the hyperV (lets say A), and then present it to hyperv-B, B will see the LUN as inactive.

I understand that two Hyper-V's cannot own the LUN at the same time for obvious reasons, so my question is if hyperv-A dies and I want hyperv-B to take ownership of that LUN without formatting, is there a command to do it?

I used this command to format the disk orginally

Initialize-Disk–Number <Disk_Number> –PartitionStyle GPT –PassThru | New-Partition –AssignDriveLetter –UseMaximumSize | Format-Volume

would it be set-disk to get it online and readable to hyperv-B?

thanks