Prior to using SRM to protect virtual machines with vVol based replication, the underlying vVol storage environment must be configured.
Ensure pre-requisites are followed here: SRM User Guide: FlashArray vVols Array Based Replication and SRM - Requirements and Limitations
Once the pre-requisites are complete, verify the configuration of both vCenters. Each vCenter should have two VASA providers configured from each local FlashArray and a respective vVol datastore for that FlashArray mounted and online. The vVol datastore should be mounted to any cluster that is intended for vVol-based VM placement.
The VASA providers can be registered and the vVol datastore can be mounted in a variety of ways, but the most common options are: