Exception in function does not return exceptions on functions in function monitor - .net-core

Question

The azure function is a .net core class library that will receive the message based on the namespace of the model being sent (in the filter as eventType) as an . All deployments are being done using arm templates, which is where this struggle is originating from. The function and eventgrid are deployed fine, but I don't know what i'm doing wrong with the subscription. If I create the subscription in the portal then the handler receives the message and displays traffic on the monitor. If I create the subscription as below then it appears exactly the same in the portal as the portal created one but nothing shows up in the monitor. Am I missing a resource or connection that still needs to be created? I read about system topics and how they're made implicitly in some instances but can be made explicitly, is that what I'm missing? This would be easier to debug if there was a place to export the template for those subscriptions but I don't see them.
Function handler
[FunctionName("FunctionName")]
public async Task Run([EventGridTrigger]EventGridEvent eventGridEvent)
{
...
}
}
eventgrid creation
{
"type": "Microsoft.EventGrid/topics",
"apiVersion": "2020-06-01",
"name": "[variables('EventGridName')]",
"location": "[resourceGroup().location]"
}
subscription creations
{
"name": "[concat(variables('eventSubscriptions')[copyIndex()].eventGridName, '/Microsoft.EventGrid/', variables('eventSubscriptions')[copyIndex()].name)]",
"type": "Microsoft.EventGrid/topics/providers/eventSubscriptions",
"apiVersion": "2020-01-01-preview",
"location": "[resourceGroup().location]",
"copy": {
"name": "subscriptionCopy",
"count": "[length(variables('eventSubscriptions'))]"
},
"properties": {
"topic": "[concat('/subscriptions/', subscription().subscriptionId,'/resourcegroups/', resourceGroup().name, '/providers/Microsoft.EventGrid/topics/', variables('eventSubscriptions')[copyIndex()].eventGridName)]",
"destination": {
"endpointType": "AzureFunction",
"properties": {
"resourceId": "[concat('/subscriptions/', subscription().subscriptionId,'/resourcegroups/', resourceGroup().name, '/providers/Microsoft.Web/sites/', variables('eventSubscriptions')[copyIndex()].functionApp, '/functions/' , variables('eventSubscriptions')[copyIndex()].functionName)]",
"maxEventsPerBatch": 1,
"preferredBatchSizeInKilobytes": 64
}
},
"filter": {
"includedEventTypes": [
"[variables('eventSubscriptions')[copyIndex()].eventType]"
]
},
"labels": [],
"eventDeliverySchema": "EventGridSchema"
},
"dependsOn": [
]
}