Azure dashboard not found after setting via API - azure

Question

I am testing the setting of simple dashboard examples using Azure CLI. Using docs The structure of Azure dashboards This file is a single tile (a small square of browser window) that outputs a short message. I used the following command in VS Code terminal:
az portal dashboard import --name "mySingleTileDashboard1" --resource-group "example-resources_copy" --input-path singleTileDashboard.json
Here is the terminal output showing the .JSON script.
{
"id": "/subscriptions/xxxxxxxxxxxx/resourceGroups/example-resources_copy/providers/Microsoft.Portal/dashboards/mySingleTileDashboard1",
"lenses": {
"0": {
"metadata": null,
"order": 0,
"parts": {
"0": {
"metadata": null,
"position": {
"colSpan": 3,
"metadata": null,
"rowSpan": 2,
"x": 0,
"y": 0
}
}
}
}
},
"location": "westus",
"metadata": {
"inputs": [],
"settings": {
"content": {
"settings": {
"content": "## Dashboard Overview\r\nSingle tile example. Code lifted from azure-portal-dashboards-structure",
"subtitle": "",
"title": ""
}
}
},
"type": "Extension/HubsExtension/PartType/MarkdownPart"
},
"name": "mySingleTileDashboard1",
"resourceGroup": "example-resources_copy",
"tags": {
"hidden-title": "Created via API"
},
"type": "Microsoft.Portal/dashboards"
}
The portal shows that the dashboard has been set. The Overview shows all parameters present. But when I use "Go to dashboard" I get an error page:
Dashboard 'arm/subscriptions/xxxxxxxxxx/resourcegroups/example-resources_copy/providers/microsoft.portal/dashboards/mysingletiledashboard1' no longer exists. It was previously published to resource group 'example-resources_copy' in subscription 'xxxxxxxxxxxxx'.
I followed through on the error using Resolve errors for resource not found The Activity Log showed that the Set Dashboard Succeeded.
The doubt I had, in my script, was the following line:
"type": "Extension/HubsExtension/PartType/MarkdownPart"
The docs show the line to be Extension[azure]/ ... etc. However I tried both versions but got the same result.
Previously I have only set a blank dashboard via script. And it worked. Here it doesn't. So I have a suspicion the line with the MarkdownPart may be screwing things up.