Template "HPE Primera by HTTP" has a macro {$HPE.PRIMERA.API.PORT} which is used by item: "HPE Primera: Service ping"

net.tcp.service["{$HPE.PRIMERA.API.SCHEME}","{HOST.CONN}","{$HPE.PRIMERA.API.PORT}"]

However the primary Mater item: "HPE Primera: Get data | hpe.primera.get.data" does not include that macro in the parameters for the script which means it's defaulting to (presumably) 443, despite that macro can define another port.

Updating the Master item's "base_url" parameter to this (adding :{$HPE.PRIMERA.API.PORT} at the end):

{$HPE.PRIMERA.API.SCHEME}://{HOST.CONN}:{$HPE.PRIMERA.API.PORT}

allowed the item to successfully pull data.