Node-RED is behind the groov Manage authentication service.
What port number did you try when you tested this?
The URL would have to be https (port 443) and have the /node-red/ path.
To authenticate with groov devices you’ll need a groov Manage admin API key, not the Node-RED admin tokens, and like @Beno said you will use the https and the /node-red/ path instead of port 1880.
In this case /nodes is the NR admin API endpoint which you can swap out with whatever you need.
Here’s a rough, example: