Azure - create deployment slot node.js - ResourceNotFound - node.js

Question

I am trying to create a deployment slot on Azure using node.js SDK (npm package #azure/arm-appservice)
This is how I call the method:
const msRest = require('#azure/ms-rest-nodeauth');
const armWebsite = require('#azure/arm-appservice');
async function createDeploymentSlot(){
const credentials = await msRest.loginWithServicePrincipalSecret("clientId", "secret", "domain");
const webManagementClient = armWebsite.WebSiteManagementClient(credentials, "subscriptionId");
const deployment = {
location : "westus"
}
return webManagementClient.webApps.createDeploymentSlot(
"test-resource-group-name",
"test-app-name",
"", //ID of an existing deployment??
"test-new-slot-name",
deployment
)
}
And I am getting the following error:
Error: The Resource 'Microsoft.Web/sites/test-app-name/slots/test-new-slot-name' under resource group 'test-resource-group-name' was not found.
Which is a very weird, because it says it can't find the resource I am trying to create.
What am I doing wrong?
Thanks

Answer 1

If you want to create a deployment slot for your web app, you need to use the createOrUpdateSlot method, note the location need to be the same with the web app.
Sample:
const msRest = require('#azure/ms-rest-nodeauth');
const armWebsite = require('#azure/arm-appservice');
async function main(){
const credentials = await msRest.loginWithServicePrincipalSecret("clientId", "secret", "domain");
const webManagementClient = new armWebsite.WebSiteManagementClient(credentials, "subscriptionId");
const siteEnvelope = '{"location":"centralus","enabled":true}';
const obj = JSON.parse(siteEnvelope);
const a = await webManagementClient.webApps.createOrUpdateSlot(
"groupname",
"joywebapp",
obj,
"slot2"
);
console.log(a)
}
main();