Is this feature working?

### Type of issue

Other (describe below)

### Feedback

Hello,

I tried getting this feature to work. I think I did everything right (at least I did not get any error messages and can't find any log suggesting otherwhise).

My Policy looks like this:

```
SourceAddresses : {*}
TargetFqdns : {login.microsoftonline.com, login.microsoft.com, login.windows.net}
FqdnTags : {}
Protocols : {Microsoft.Azure.Commands.Network.Models.PSAzureFirewallPolicyApplicationRuleProtocol,
Microsoft.Azure.Commands.Network.Models.PSAzureFirewallPolicyApplicationRuleProtocol}
SourceIpGroups : {}
WebCategories : {}
TargetUrls : {}
TerminateTLS : True
HttpHeadersToInsert : {Restrict-Access-To-Tenants, Restrict-Access-Context}
Description :
ProtocolsText : [
{
"protocolType": "Http",
"port": 80
},
{
"protocolType": "Https",
"port": 443
}
]
SourceAddressesText : [
"*"
]
SourceIpGroupsText : []
TargetFqdnsText : [
"login.microsoftonline.com",
"login.microsoft.com",
"login.windows.net"
]
FqdnTagsText : []
WebCategoriesText : []
TargetUrlsText : []
HttpHeadersToInsertText : [
{
"headerName": "Restrict-Access-To-Tenants",
"headerValue": "111fd61c-a2a5-4514-8a8a-f923d46b9b79"
},
{
"headerName": "Restrict-Access-Context",
"headerValue": "111fd61c-a2a5-4514-8a8a-f923d46b9b79"
}
]
Name : restricttenant
RuleType : ApplicationRule
```

However the header is not beeing inserted. Is this feature active? If not is there a timeline as when it is? Any information is greatly appreciated.

### Page URL

https://learn.microsoft.com/en-us/powershell/module/az.network/new-azfirewallpolicyapplicationrulecustomhttpheader?view=azps-12.1.0

### Content source URL

https://github.com/Azure/azure-powershell/blob/main/src/Network/Network/help/New-AzFirewallPolicyApplicationRuleCustomHttpHeader.md

### Author

@mikefrobbins

### Document Id

5632839f-f7b1-f5ef-9e3f-25b6f8101125

Start with the New-AzFirewallPolicyApplicationRuleCustomHttpHeader entry point and the help source at src/Network/Network/help/New-AzFirewallPolicyApplicationRuleCustomHttpHeader.md. Reproduce the reported Azure Firewall policy behavior using the example configuration, then determine whether the headers are inserted and update the issue or documentation with the confirmed behavior and support status.

Written by the indexing model from the issue text.