VSAN snapshot appliance is deployed as a VM in vCenter, however you still see the message to deploy vSAN snapshot appliance when attempting setup.
vCenter does not install new plugin to communicate to the snapshot appliance; as plugins are only installed when needed.
VMware vSAN 8.0u3 or later.
The Client plugin: VMware vSAN Snapshot manager UI Plugin, does not exist.
If the VM deployed, logs related to issue for the snap service appliance itself can be located under: /storage/logs/snapservice
* If the VM did not deploy, please log a case with Broadcom Support, to investigate why the template is failing deployment.
Redeploy the vSAN snapshot appliance, and double check the certificates, and root trust. Before redeploying and ensuring configuration in appliance is correct.
Please see KB article, going into more details for deploying vSAN Snapshot Appliance, to assist with proper configuration of the template
For vetting certificate health, please see KB on our tool that can assist in identify certificate and SSL trust issues.