In the search parameter http://hl7.org/fhir/us/ndh/SearchParameter/healthcareservice-new-patient-from-network the values in the element SearchParameter.chain do not show up as search parameter codes in the IG or the FHIR R4 registry.

They should be codes:
(Source https://hl7.org/fhir/R4/searchparameter-definitions.html)

Existing values:

"chain" : ["organization-identifier",
"organization-name",
"organization-partof"]

Suggested resolution:

"chain" : ["identifier",
"name",
"partof"]