Verify that you have a valid license for Virtual SAN.
Using Virtual SAN in production environments requires a special license that you assign to the Virtual SAN clusters.
You can assign a standard Virtual SAN license to the cluster, or a license that covers advanced functions. Some advanced features require a license that supports the feature. Advanced features include all-flash configuration, software checksum, IOPS limits, deduplication and compression, and stretched clusters. For information about assigning licenses, see Configure License Settings for a Virtual SAN Cluster.
The capacity of the license must cover the total number of CPUs in the cluster.