ARM Template unable to set $connections - validation

Question

I have created an ARM template in Visual Studio project with connection to slack. When I connect to slack in Azure portal - everything is fine. My slack API connection is authorized and works. My problem is with deployment and setting $connections.
Here is my template
{
"$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
<template-params>
},
"variables": {
"slack": "[concat(parameters('appPrefix'), '-slack-', parameters('environment'))]"
},
"resources": [
{
"type": "Microsoft.Web/connections",
"apiVersion": "2016-06-01",
"location": "[resourceGroup().location]",
"name": "[variables('slack')]",
"properties": {
"api": {
"id": "[concat('/subscriptions/', subscription().subscriptionId, '/providers/Microsoft.Web/locations/', resourceGroup().location, '/managedApis/slack')]"
},
"displayName": "Slack",
"parameterValues": {}
}
},
{
"name": "[parameters('logicAppName')]",
"type": "Microsoft.Logic/workflows",
"location": "[parameters('logicAppLocation')]",
"tags": {
"displayName": "LogicApp"
},
"apiVersion": "2016-06-01",
"properties": {
"definition": {
"$schema": "https://schema.management.azure.com/providers/Microsoft.Logic/schemas/2016-06-01/workflowdefinition.json#",
"actions": {
"Collecting_went_wrong": {
"inputs": {
"host": {
"connection": {
"name": "#parameters('$connections')['slack']['connectionId']"
}
},
"method": "post",
"path": "/chat.postMessage",
"queries": {
"channel": "<channel>",
"text": "<message>",
"username": "<user>"
}
},
"runAfter": {},
"type": "ApiConnection"
}
},
"parameters": {
"$connections": {
"type": "object",
"defaultValue": {
}
}
},
"triggers": {
<trigger>
}
},
"parameters": {
"$connections": {
"value": {
"slack": {
"id": "[resourceId('Microsoft.Web/connections', variables('slack'))]",
"connectionId": "[resourceId('Microsoft.Web/connections', variables('slack'))]",
"connectionName": "slack"
}
}
}
}
},
"dependsOn": [
"[resourceId('Microsoft.Web/connections', variables('slack'))]"
]
}
],
"outputs": {}
}
The 'fun' part is validation of template during the deployment:
New-AzureRmResourceGroupDeployment : 17:08:51 - Resource Microsoft.Logic/workflows 'reporting-reminder-logic-app-dev'
failed with message '{
"error": {
"code": "ConnectionsParameterInvalid",
"message": "The provided API connection parameter 'slack' is missing the required property 'id'."
}
}'
I'm really confused here.
What I tried to deploy it as connection and added $connection parameter definition as well, deployment went through. Nevertheless, when I changed connection to $connections in template parameters, Azure portal throw at me the same validation error.
Any idea what am I doing wrong here?
Thanks

Answer 1

The issue was about different ID in resources -> Microsoft/Web.connections -> properties -> id and slack -> connection. Once this connection ids were the same, the validation passed.
So it's only confusing validation message.