Error Message

Additional data disks are not accessible. 
The disk is offline because of a policy set by an administrator. 
 

This issue is observed when VMware Virtual Machine instant recovery is performed on a higher version target ESXi than the lower version source ESXi. (i.e. source ESXi version is 7.0 and target ESXi version is 8.0). The issue can be observed in other scenarios as well. 

A SAN policy has been introduced in Windows Server 2008 or higher to protect shared disks accessed by multiple servers. By default, Windows machines will have the SAN policy set to be Offline Shared. Thus, the first time the VM sees the disk, it'll be offline, but after being brought online once, it should be online even after a reboot. 
 

Refer to the VMware article referencing how to disks online:

Unable to initialize a second virtual disk on VMs running Windows 2008 or newer (https://kb.vmware.com/s/article/2000767)