[BUG] Microsoft.AzureActiveDirectory/ciamDirectories: The location enum is empty in JSON schema

[StephenWeatherford]

API Spec link

https://github.com/Azure/azure-rest-api-specs/blob/main/specification/cpim/resource-manager/Microsoft.AzureActiveDirectory/preview/2023-05-17-preview/externalIdentities.json

API Spec version

preview/2023-05-17-preview

Describe the bug

The location enum is empty in the JSON schema, which I believe is invalid for draft-04. At any rate, VS's schema code flags it as an error, which is causing a blocking bug in the Azure ARM Tools extension for VSCode:

    "ciamDirectories": {
      "description": "Microsoft.AzureActiveDirectory/ciamDirectories",
      "properties": {
        "apiVersion": {
          "enum": [
            "2023-05-17-preview"
          ],
          "type": "string"
        },
        "location": {
          "description": "The location in which the resource is hosted and data resides. Can be one of 'United States', 'Europe', 'Asia Pacific', or 'Australia'. Refer to [this documentation](https://aka.ms/ciam-data-location) for more information.",
          "oneOf": [
            {
              "enum": [],                // <<<<<<<<<<<<<<<<<<<<<<< INVALID EMPTY ENUM
              "type": "string"

I think the swagger definition is here:

azure-rest-api-specs/specification/cpim/resource-manager/Microsoft.AzureActiveDirectory/preview/2023-05-17-preview/externalIdentities.json

Line 1720 in b23fa4c

"x-ms-enum": {

Expected behavior

The enum should not be invalid, and the schema should be http://json-schema.org/draft-04/schema# compliant.

Actual behavior

The following error occurs in the Azure ARM Tools extension in VS Code if I try to update it to use the newest schemas:
microsoft/vscode-azurearmtools#1733 (comment):

[Error - 4:27:28 PM] There are problems with this document's schema impacting one or more items in the document. Please report this issue to schema owner.

[Error - 4:27:28 PM]     Value must conform to at least one of the associated schemas
    |   Referenced item does not validate against the current schema.
    |   The issue encountered is "There must be at least 1 and at most 9223372036854775807 items defined in the array" at ../2023-05-17-preview/Microsoft.AzureActiveDirectory.json#/resourceDefinitions/ciamDirectories/properties/location/oneOf/0/enum at #/resourceDefinitions/ciamDirectories/properties/location/oneOf/0/enum
    |   or
    |   Value must be one of the following types: array
    at (line 530, column 5) in document https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json
    at schema text "resource"

[Error - 4:27:28 PM]     Value must conform to at least one of the associated schemas
    |   Value must be one of the following types: boolean
    |   or
    |   Referenced item does not validate against the current schema.
    |   The issue encountered is "There must be at least 1 and at most 9223372036854775807 items defined in the array" at ../2023-05-17-preview/Microsoft.AzureActiveDirectory.json#/resourceDefinitions/ciamDirectories/properties/location/oneOf/0/enum at #/resourceDefinitions/ciamDirectories/properties/location/oneOf/0/enum
    at (line 530, column 5) in document https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json
    at schema text "resource"

[Info  - 4:27:28 PM] Published 1 errors, 0 warnings for untitled:Untitled-2

Reproduction Steps

See above

Environment

N/A

[v-jiaodi]

@AndresZourelli Please help take a look, thanks.