SOLVED: The Cluster Resource Could Not Be Deleted Since It Is A Core Resource

Recently we were changing the Windows Failover Cluster Windows File Share Witness used for quorum on a two node cluster. Adding the new File Share Witness was straight forward (as we explained in THIS article and video), but trying to remove the old Cluster File Share Witness resulted in an error: The Cluster Resource Could Not Be Deleted Since It Is A Core Resource.

Fortunately, we were able to goof around in our clients test environment until we figured it out. The solution was to simply run the Configure Cluster Quorum Settings wizard again, but this time, to select DO NOT CONFIGURE A QUORUM WITNESS.

As soon as we clicked NEXT on the DO NOT CONFIGURE QUORUM WITNESS, the old file share witness for quorum was removed. We did not even have to click FINISH.