Logic App deployment from Visual Studio 2017 fails - visual-studio

Question

I have created a Logic App in Azure which works fine in Azure itself. So I first recreated the Logic App within VS2017 (with "Azure Logic Apps for Visual Studio" extension installed). The logic app contains a trigger to read from the Azure Servicebus and calls a custom logic app connector action. This custom connector calls a SOAP webservice via an Azure Data Gateway, which runs fine.
Now the issue is that when I try to deploy it from VS2017, it complains in the Output window. The message I get is:
New-AzureRmResourceGroupDeployment : 13:41:34 - Resource MICROSOFT.WEB/CONNECTIONS 'MyCustomConnector' failed with message '{"error": {"code": "ConnectionGatewayFailure","message": "Establishing connection with the service failed with code 'BadRequest'."}}'
My Logic App works great because I receive the SOAP request in my on-premise application.
What I have tried so far:
Checked my permissions, I am now owner of the resource groups (one where the Logic App and custom connector resides in, and one where the Gateway resides in)
Copied content in: "My resource group > Settings > Automation script > Json Template" and pasted it into Visual Studio
Run Visual Studio as Administrator
Added "-DeploymentDebugLogLevel All" to my Deploy-AzureResourceGroup.ps1 file, doesn't show me anything more useful.
Troubleshoot common Azure deployment errors which says for BadRequest: "You sent deployment values that do not match what is expected by Resource Manager. Check the inner status message for help with troubleshooting." I see no inner status message.
Checked Google for a useful answer
But up until now, without success. So hopefully some of you can help me.
Edit: Here's my ARM template, I renamed a few things, hopefully not too much.
{
"$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"connections_servicebus_name": {
"defaultValue": "servicebus",
"type": "String"
},
"customApis_MyCustomConnector_name": {
"defaultValue": "My-Custom-Connector",
"type": "String"
},
"connections_MyCustomConnector_name": {
"defaultValue": "My-Custom-Connector",
"type": "String"
},
"workflows_MyLogicApp_name": {
"defaultValue": "My-LogicApp",
"type": "String"
},
"workflows_MyLogicApp_id": {
"defaultValue": "/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/MyResourceGroup/providers/Microsoft.Logic/integrationAccounts/My-Integration-Account",
"type": "String"
}
},
"variables": {},
"resources": [
{
"comments": "Generalized from resource: '/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/MyResourceGroup-B/providers/Microsoft.Logic/workflows/My-LogicApp'.",
"type": "Microsoft.Logic/workflows",
"name": "[parameters('workflows_MyLogicApp_name')]",
"apiVersion": "2017-07-01",
"location": "westeurope",
"tags": {},
"scale": null,
"properties": {
"state": "Enabled",
"integrationAccount": {
"id": "[parameters('workflows_MyLogicApp_id')]"
},
"definition": {
"$schema": "https://schema.management.azure.com/providers/Microsoft.Logic/schemas/2016-06-01/workflowdefinition.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"$connections": {
"defaultValue": {},
"type": "Object"
}
},
"triggers": {
},
"actions": {
},
"outputs": {}
},
"parameters": {
"$connections": {
"value": {
"My-Custom-Connector": {
"connectionId": "[resourceId('Microsoft.Web/connections', parameters('connections_MyCustomConnector_name'))]",
"connectionName": "My-Custom-Connector",
"id": "[resourceId('Microsoft.Web/customApis', parameters('customApis_MyCustomConnector_name'))]"
},
"servicebus": {
"connectionId": "[resourceId('Microsoft.Web/connections', parameters('connections_servicebus_name'))]",
"connectionName": "servicebus",
"id": "/subscriptions/00000000-0000-0000-0000-000000000000/providers/Microsoft.Web/locations/westeurope/managedApis/servicebus"
}
}
}
}
},
"dependsOn": [
"[resourceId('Microsoft.Web/connections', parameters('connections_MyCustomConnector_name'))]",
"[resourceId('Microsoft.Web/customApis', parameters('customApis_MyCustomConnector_name'))]",
"[resourceId('Microsoft.Web/connections', parameters('connections_servicebus_name'))]"
]
},
{
"comments": "Generalized from resource: '/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/MyResourceGroup-B/providers/Microsoft.Web/connections/My-Custom-Connector'.",
"type": "Microsoft.Web/connections",
"name": "[parameters('connections_MyCustomConnector_name')]",
"apiVersion": "2016-06-01",
"location": "westeurope",
"scale": null,
"properties": {
"displayName": "LogicAppsCustomConnector-Connection",
"customParameterValues": {},
"api": {
"id": "[resourceId('Microsoft.Web/customApis', parameters('customApis_MyCustomConnector_name'))]"
}
},
"dependsOn": [
"[resourceId('Microsoft.Web/customApis', parameters('customApis_MyCustomConnector_name'))]"
]
},
{
"comments": "Generalized from resource: '/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/MyResourceGroup-B/providers/Microsoft.Web/connections/servicebus'.",
"type": "Microsoft.Web/connections",
"name": "[parameters('connections_servicebus_name')]",
"apiVersion": "2016-06-01",
"location": "westeurope",
"scale": null,
"properties": {
"displayName": "worker_outbound",
"customParameterValues": {},
"api": {
"id": "[concat('/subscriptions/00000000-0000-0000-0000-000000000000/providers/Microsoft.Web/locations/westeurope/managedApis/', parameters('connections_servicebus_name'))]"
}
},
"dependsOn": []
},
{
"comments": "Generalized from resource: '/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/MyResourceGroup-B/providers/Microsoft.Web/customApis/My-Custom-Connector'.",
"type": "Microsoft.Web/customApis",
"name": "[parameters('customApis_MyCustomConnector_name')]",
"apiVersion": "2016-06-01",
"location": "westeurope",
"scale": null,
"properties": {
"connectionParameters": {
"authType": {
"type": "string",
"allowedValues": [
{
"value": "none"
}
],
"uiDefinition": {
"displayName": "Authentication Type",
"description": "Authentication type to connect to your API",
"tooltip": "Authentication type to connect to your API",
"constraints": {
"tabIndex": 1,
"required": "true",
"allowedValues": [
{
"text": "none",
"value": "anonymous"
}
],
"capability": [
"gateway"
]
}
}
},
"gateway": {
"type": "gatewaySetting",
"gatewaySettings": {
"dataSourceType": "CustomConnector",
"connectionDetails": []
},
"uiDefinition": {
"constraints": {
"tabIndex": 4,
"required": "true",
"capability": [
"gateway"
]
}
}
}
},
"brandColor": "#ffffff",
"description": "Calls My SOAP test webservice.",
"displayName": "[parameters('customApis_MyCustomConnector_name')]",
"iconUri":
},
"dependsOn": []
}
]
}