For Element discovery, an FA Proxy switch will not process assignment requests coming from another Proxy.
So if you do “show fa element” on the middle Proxy that has an FA Server upstream and an FA Proxy downstream:
FA Server(VSP) <--> FA Proxy (ERS) <--> FA Proxy (ERS)
The middle FA Proxy will support Assignments from directly attached FA Clients and also send and have valid FA Assignments accepted that are created directly on itself. (BTW, the Element “discovery” part will still work) ANY subsequent “chained” FA Proxy will not have it’s Assignments relayed/forwarded through the Proxy that is connected to the FA Server switch. The device will be in “pending” state on the edge FA Proxy.