In the cluster probe the Available Storage group is red.
Release: UIM Cluster probe 3.x
Component: UIMCLU
The available storage group is offline in the cluster. This is very common in MS.
This can be verified by running the following powershell command on a node in the cluster
Get-ClusterGroup, e.g.
The Available Storage group is offline by default if there is no disk assigned to it.
To bring it online either add a disk to available storage or run the Powershell command
Start-ClusterGroup "Available Storage."