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Correct you can only use site aggregation to a on prem site with the workspace service in Citrix cloud

Thanks John, Just wrapping my head around the key differences in the connection chain

Just be aware that Service Continuity is not supported with site aggregation to on-prem deployments. https://docs.citrix.com/en-us/citrix-workspace/optimize-cvad/service-continuity.html#site-requirements

Thak you Uzair, useful to know!