Search-AzGraph not returning SkipToken

### Description

When running a Search-AzGraph in some instances a Null SkipToken is returned making it impossible to correctly pull all records when rowcount >1000.

Specifically with this query SkipToken == Null

securityresources
| where type == "microsoft.security/pricings"
| extend tier = properties.pricingTier
| extend PlanEnabled = iff(tier=='Free', "No", "Yes")
| project subscriptionId, name, PlanEnabled
| join kind=leftouter(
resourcecontainers
| where type == "microsoft.resources/subscriptions"
| extend SubscriptionName = name
) on `$left.subscriptionId == `$right.subscriptionId
| project subscriptionId, SubscriptionName, name, PlanEnabled
| sort by subscriptionId asc, SubscriptionName asc, name asc

### Issue script & Debug output

```PowerShell
PS > $DebugPreference='Continue'
PS > $KQuery = @"
>> securityresources
>> | where type == "microsoft.security/pricings"
>> | extend tier = properties.pricingTier
>> | extend PlanEnabled = iff(tier=='Free', "No", "Yes")
>> | project subscriptionId, name, PlanEnabled
>> | join kind=leftouter(
>> resourcecontainers
>> | where type == "microsoft.resources/subscriptions"
>> | extend SubscriptionName = name
>> ) on `$left.subscriptionId == `$right.subscriptionId
>> | project subscriptionId, SubscriptionName, name, PlanEnabled
>> | sort by subscriptionId asc, SubscriptionName asc, name asc
>> "@
PS >
PS > $Return = Search-AzGraph -ManagementGroup $ManagementGroup -Query $KQuery -First 10
DEBUG: 15:00:05 - SearchAzureRmGraph begin processing with ParameterSet 'TenantScopedQuery'.
DEBUG: 15:00:05 - using account id '**USER REMOVED**'...
DEBUG: [Common.Authentication]: Authenticating using Account: '**USER REMOVED**', environment: 'AzureCloud', tenant: '**TENANTID REMOVED**'
DEBUG: 15:00:05 - [SilentAuthenticator] Calling SharedTokenCacheCredential.GetTokenAsync - TenantId:'**TENANTID REMOVED**', Scopes:'https://management.core.windows.net//.default', AuthorityHost:'https://login.microsoftonline.com/', UserId:'**USER REMOVED**'
DEBUG: SharedTokenCacheCredential.GetToken invoked. Scopes: [ https://management.core.windows.net//.default ] ParentRequestId:
DEBUG: (False) MSAL 4.30.1.0 MSAL.NetCore Microsoft Windows 10.0.22000 [12/16/2021 15:00:05 - ] Azure region was not configured or could not be discovered. Not using a regional authority.
DEBUG: (False) MSAL 4.30.1.0 MSAL.NetCore Microsoft Windows 10.0.22000 [12/16/2021 15:00:05] Found 2 cache accounts and 0 broker accounts
DEBUG: (False) MSAL 4.30.1.0 MSAL.NetCore Microsoft Windows 10.0.22000 [12/16/2021 15:00:05] Returning 2 accounts
DEBUG: (False) MSAL 4.30.1.0 MSAL.NetCore Microsoft Windows 10.0.22000 [12/16/2021 15:00:05 - ] MSAL MSAL.NetCore with assembly version '4.30.1.0'. CorrelationId(c7b804bc-ee0b-429a-95bf-5c0f1e474ed9)
DEBUG: (False) MSAL 4.30.1.0 MSAL.NetCore Microsoft Windows 10.0.22000 [12/16/2021 15:00:05 - ] === AcquireTokenSilent Parameters ===
DEBUG: (False) MSAL 4.30.1.0 MSAL.NetCore Microsoft Windows 10.0.22000 [12/16/2021 15:00:05 - ] LoginHint provided: False
DEBUG: (False) MSAL 4.30.1.0 MSAL.NetCore Microsoft Windows 10.0.22000 [12/16/2021 15:00:05 - ] Account provided: True
DEBUG: (False) MSAL 4.30.1.0 MSAL.NetCore Microsoft Windows 10.0.22000 [12/16/2021 15:00:05 - ] ForceRefresh: False
DEBUG: (False) MSAL 4.30.1.0 MSAL.NetCore Microsoft Windows 10.0.22000 [12/16/2021 15:00:05 - ]
=== Request Data ===
Authority Provided? - True
Scopes - https://management.core.windows.net//.default
Extra Query Params Keys (space separated) -
ApiId - AcquireTokenSilent
IsConfidentialClient - False
SendX5C - False
LoginHint ? False
IsBrokerConfigured - False
HomeAccountId - False
CorrelationId - c7b804bc-ee0b-429a-95bf-5c0f1e474ed9

DEBUG: (False) MSAL 4.30.1.0 MSAL.NetCore Microsoft Windows 10.0.22000 [12/16/2021 15:00:05 - ] === Token Acquisition (SilentRequest) started:

Authority Host: login.microsoftonline.com
DEBUG: (False) MSAL 4.30.1.0 MSAL.NetCore Microsoft Windows 10.0.22000 [12/16/2021 15:00:05 - ] Azure region was not configured or could not be discovered. Not using a regional authority.
DEBUG: (False) MSAL 4.30.1.0 MSAL.NetCore Microsoft Windows 10.0.22000 [12/16/2021 15:00:05 - ] Access token is not expired. Returning the found cache entry. [Current time (12/16/2021 15:00:05) - Expiration Time (12/16/2021 15:38:02 +00:00) - Extended Expiration Time (12/16/2021 15:38:02 +00:00)]
DEBUG: (False) MSAL 4.30.1.0 MSAL.NetCore Microsoft Windows 10.0.22000 [12/16/2021 15:00:05 - ] Returning access token found in cache. RefreshOn exists ? False
DEBUG: (False) MSAL 4.30.1.0 MSAL.NetCore Microsoft Windows 10.0.22000 [12/16/2021 15:00:05 - ] Fetched access token from host login.microsoftonline.com.
DEBUG: (False) MSAL 4.30.1.0 MSAL.NetCore Microsoft Windows 10.0.22000 [12/16/2021 15:00:05 - ] === Token Acquisition finished successfully. An access token was returned with Expiration Time: 12/16/2021 15:38:02 +00:00 and Scopes https://management.core.windows.net//user_impersonation https://management.core.windows.net//.default
DEBUG: SharedTokenCacheCredential.GetToken succeeded. Scopes: [ https://management.core.windows.net//.default ] ParentRequestId: ExpiresOn: 2021-12-16T15:38:02.0000000+00:00
DEBUG: [Common.Authentication]: Received token with LoginType 'User', Tenant: '**TENANTID REMOVED**', UserId: '**USER REMOVED**'
DEBUG: ============================ HTTP REQUEST ============================

HTTP Method:
POST

Absolute Uri:
https://management.azure.com/providers/Microsoft.ResourceGraph/resources?api-version=2021-03-01

Headers:
x-ms-client-request-id : bd6a0d59-e4a3-44e6-a21b-0d05f5ff77b8
Accept-Language : en-US

Body:
{
"managementGroups": [
"**MANAGEMENTGROUPID REMOVED**"
],
"query": "securityresources \n| where type == \"microsoft.security/pricings\" \n| extend tier = properties.pricingTier \n| extend PlanEnabled = iff(tier=='Free', \"No\", \"Yes\")\n| project subscriptionId, name, PlanEnabled\n| join kind=leftouter(\n resourcecontainers\n | where type == \"microsoft.resources/subscriptions\"\n | extend SubscriptionName = name\n) on $left.subscriptionId == $right.subscriptionId\n| project subscriptionId, SubscriptionName, name, PlanEnabled\n| sort by subscriptionId asc, SubscriptionName asc, name asc",
"options": {
"$top": 10,
"$skip": 0,
"resultFormat": "objectArray",
"allowPartialScopes": false
}
}

DEBUG: ============================ HTTP RESPONSE ============================

Status Code:
OK

Headers:
Cache-Control : no-cache
Pragma : no-cache
Strict-Transport-Security : max-age=31536000; includeSubDomains
x-ms-ratelimit-remaining-tenant-resource-requests: 14
x-ms-user-quota-remaining : 14
x-ms-user-quota-resets-after : 00:00:05
Server : Kestrel
x-ms-ratelimit-remaining-tenant-reads: 11997
x-ms-request-id : ad38bd7e-5cfc-4598-a3b4-82f90659ae18
x-ms-correlation-request-id : ad38bd7e-5cfc-4598-a3b4-82f90659ae18
x-ms-routing-request-id : UKSOUTH:20211216T150005Z:ad38bd7e-5cfc-4598-a3b4-82f90659ae18
X-Content-Type-Options : nosniff
Date : Thu, 16 Dec 2021 15:00:05 GMT

Body:
{
"totalRecords": 624,
"count": 10,
"data": [
**DATA REMOVED**
],
"facets": [],
"resultTruncated": "true"
}

DEBUG: AzureQoSEvent: Module: Az.ResourceGraph:0.11.0; CommandName: Search-AzGraph; PSVersion: 7.2.0-preview.7; IsSuccess: True; Duration: 00:00:00.9699561
DEBUG: Finish sending metric.
DEBUG: 15:00:07 - SearchAzureRmGraph end processing.
PS >
PS > # Get the Return.SkipToken
PS > $Return.SkipToken
PS >
```

### Environment data

```PowerShell
PS >$PSVersionTable

Name Value
---- -----
PSVersion 7.2.0-preview.7
PSEdition Core
GitCommitId 7.2.0-preview.7
OS Microsoft Windows 10.0.22000
Platform Win32NT
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1
WSManStackVersion 3.0
```

### Module versions

```PowerShell
PS> Get-Module Az*

ModuleType Version PreRelease Name ExportedCommands
---------- ------- ---------- ---- ----------------
Script 2.6.2 Az.Accounts {Add-AzEnvironment, Clear-AzContext, Clear-AzDefault, Connect-AzAccount…}
Script 0.11.0 Az.ResourceGraph {Search-AzGraph, Get-AzResourceGraphQuery, New-AzResourceGraphQuery, Remove-AzResourceGraphQuery…}
```

### Error output

```PowerShell
DEBUG: 15:09:22 - ResolveError begin processing with ParameterSet 'AnyErrorParameterSet'.
DEBUG: 15:09:22 - using account id '**USER REMOVED**'...
WARNING: Upcoming breaking changes in the cmdlet 'Resolve-AzError' :
The `Resolve-Error` alias will be removed in a future release. Please change any scripts that use this alias to use `Resolve-AzError` instead.
Note : Go to https://aka.ms/azps-changewarnings for steps to suppress this breaking change warning, and other information on breaking changes in Azure PowerShell.

The Azure PowerShell team is listening, please let us know how we are doing: https://aka.ms/azpssurvey?Q_CHL=ERROR.

DEBUG: AzureQoSEvent: Module: Az.Accounts:2.6.2; CommandName: Resolve-AzError; PSVersion: 7.2.0-preview.7; IsSuccess: True; Duration: 00:00:00.0040736
DEBUG: Finish sending metric.
DEBUG: 15:09:22 - ResolveError end processing.
```