The vCenter instance that is bundled with the VxRail software and deployed during the initial build process is compatible with the VxRail software stack (which includes vSphere).
With VxRail 7.0.130 and later, VxRail Manager no longer validates whether a customer-managed vCenter Server is compatible with the VxRail software stack (which includes vSphere). To confirm that your customer-managed vCenter Server is running the minimum compatible version before commencing initial build, see the VxRail and External vCenter Interoperability Matrix.