Pds api http 500

We completed some tests last week with success. Now, for the same data, for the same scenarios we have exception like below

HTTP/1.1 500 Internal Server Error
Date: Tue, 28 May 2024 07:18:43 GMT
Content-Type: application/json
Content-Length: 837
Connection: keep-alive
Server: XXXXXX
Strict-Transport-Security: max-age=31536000; includeSubDomains
X-Correlation-ID: 83aed140-1cc2-11ef-a9d1-0696677fff19
X-Request-ID: 04bb9c86-ce5b-4796-a5d6-8a7f5c36afb8

        "resourceType": "OperationOutcome",
        "issue": [
            "severity": "error",
            "code": "unknown",
            "details": {
              "coding": [
                  "system": "https://fhir.nhs.uk/R4/CodeSystem/Spine-ErrorOrWarningCode",
                  "version": "1",
                  "code": "UNKNOWN_ERROR",
                  "display": "Unknown Error"
            "diagnostics": "An unknown error occurred processing this request. Contact us for assistance diagnosing this issue: https://digital.nhs.uk/developer/help-and-support. (Message ID: rrt-8534511542547208047-c-geu2-22740-4304499-3)"

We have conducted a direct call with postman and get the same error

We’re seeing the same problem using our regression test suite.

Worth noting that the instructions provided are incorrect and that errors on path to live environments have to be reported via: Path to Live environment forms - NHS England Digital

This appears to be working as normal again.