[BUG] Notification Hub API doesn't allow to set the registrationTtl property

[neil-yechenwei]

API Spec link

https://github.com/Azure/azure-rest-api-specs/blob/main/specification/notificationhubs/resource-manager/Microsoft.NotificationHubs/stable/2023-09-01/notificationhubs.json#L2714

API Spec version

2023-09-01

Describe the bug

I tried to set registrationTtl while creating/updating Notification Hub but this property doesn't take effect.

request payload:

PUT https://management.azure.com/subscriptions/xxxxxxx/resourceGroups/acctestRGpol-250325143111879778/providers/Microsoft.NotificationHubs/namespaces/acctestnhn-250325143111879778/notificationHubs/acctestnh-250325143111879778

{
    "location": "eastus",
    "properties": {
        "name": "acctestnh-250325143111879778",
        "registrationTtl": "P90D"
    }
}

API response:

{
  "id": "/subscriptions/xxxxxx/resourceGroups/acctestRGpol-250325143111879778/providers/Microsoft.NotificationHubs/namespaces/acctestnhn-250325143111879778/NotificationHubs/acctestnh-250325143111879778",
  "location": "East US",
  "name": "acctestnh-250325143111879778",
  "registrationTtl": "10675199.02:48:05.4775807",
  "resourceGroup": "acctestRGpol-250325143111879778",
  "type": "Microsoft.NotificationHubs/namespaces/notificationHubs"
}

Expected behavior

The registraionTtl property should be set with the specified value.

Actual behavior

The registraionTtl doesn't take effect and it always returns "10675199.02:48:05.4775807".

Reproduction Steps

1. Create resource group
2. Create notification hub namespace
3. Create notification hub with "registrationTtl=P39D"

Environment

PROD