I am now getting this error in Meplum Client application when using the resource type search.

{
  "resourceType": "OperationOutcome",
  "issue": [
    {
      "severity": "error",
      "code": "invalid",
      "details": {
        "text": "CodeSystem http://hl7.org/fhir/resource-types not found"
      }
    }
  ],
  "extension": [
    {
      "url": "https://medplum.com/fhir/StructureDefinition/tracing",
      "extension": [
        {
          "url": "requestId",
          "valueId": "8d2e1f2d-c1c7-456f-ba92-69dcf91fef16"
        },
        {
          "url": "traceId",
          "valueId": "1-67f817b4-302fc5437a46aa553bb363a3"
        }
      ]
    }
  ]
}

Our Instance is self hosted on AWS and that happens with an admin user, but it is working fine when I log in as a super admin. thanks in advance client app version -> 4.0.4-e21310ec7 backend version -> 4.0.0-cacf0021b (so far we had other issue with auth when trying to go up to 4.0.4)

Thanks so muhc for the suggestion @ysael !