ARM template StorageAccount - EventGrid

### Issue Details
I am trying the use the ARM template to provision an event-grid for a blob storage. The event grid triggers an Azure function to perform some operations.

Below is the command being run

`az group deployment create --resource-group $resourceGroupName --template-file "provision-template.json" --parameters "parameters.json";`

The provision-template.json is as follows
```
{
"$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"eventSubName": {
"type": "string",
"metadata": {
"description": "Provide a name for the Event Grid subscription."
}
},
"eventTopicPath": {
"type": "string",
"metadata": {
"description": "Provide the path to the Event Grid topic."
}
},
"endpoint": {
"type": "string",
"metadata": {
"description": "Provide the URL for the WebHook to receive events. Create your own endpoint for events."
}
}
},
"resources": [
{
"type": "Microsoft.EventGrid/eventSubscriptions",
"name": "[parameters('eventSubName')]",
"apiVersion": "2018-01-01",
"properties": {
"topic": "[parameters('eventTopicPath')]",
"destination": {
"endpointType": "WebHook",
"properties": {
"endpointUrl": "[parameters('endpoint')]"
}
},
"filter": {
"subjectBeginsWith": "",
"subjectEndsWith": "",
"isSubjectCaseSensitive": false,
"includedEventTypes": [
"Microsoft.Storage.BlobCreated",
"Microsoft.Storage.BlobDeleted"
]
},
"labels": [],
"eventDeliverySchema": "EventGridSchema"
}
}
]
}

```
The parameters.json is as below
```
{
"$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentParameters.json",
"contentVersion": "1.0.0.0",
"parameters": {
"eventSubName": {
"value": "eventsubscription-efastorage-azfunction"
},
"eventTopicPath": {
"value": "/subscriptions/88cde288-0e32-41df-a6a4-df4ebfb3d69d/resourceGroups/blobstorage-backup-poc/providers/Microsoft.Storage/StorageAccounts/storageaccname1"
},
"endpoint": {
"value": "https://my-azfunction.azurewebsites.net/api/InitiateBlobBackUp"
}
}
}
```

I get the following exception when running the command

The topic name being used is _/subscriptions/88cde288-0e32-41df-a6a4-df4ebfb3d69d/resourceGroups/blobstorage-backup-poc/providers/Microsoft.Storage/StorageAccounts/storageaccname1_
This is based on the value in the "Advaced Editior" of the Azure portal

How can I associate the storage account topic to the event grid subscription?

Start by reproducing the deployment with provision-template.json, parameters.json, and the shown az group deployment create command. Compare the Event Grid eventTopicPath and endpoint values with the resource configuration in the Azure portal's Advanced Editor; done means the deployment completes and the storage account is associated with the event subscription.

Written by the indexing model from the issue text.