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What version of Pulumi-azure is in your lock file? This new parameter was just added as of Pulumi-azure 1.10 AFAICR

Both package lock and "npm ls" showing 1.10
```"resolved": "<https://registry.npmjs.org/@pulumi/azure/-/azure-1.10.0.tgz>",
@pulumi/azure@1.10.0```

Just downloaded the TAR archive using "wget" and listed all the files with "tar tf":
```$ tar tf azure-1.10.0.tgz | grep -i gremlin
package/cosmosdb/gremlinDatabase.d.ts
package/cosmosdb/gremlinDatabase.js
package/cosmosdb/gremlinDatabase.js.map```

<@USB3LC5SA> my apologies here - I thought it was the gremlin database - therefore, you need pulumi-azure 1.11.0 to use the gremlinGraph

<@UHTP242EB> thank you for your help, works like charm.

Here's what I did:
1. npm update
2. Applied the following:
```import * as azure from "@pulumi/azure";
import * as config from "./config";

const cosmosDb = new azure.cosmosdb.Account("cosmosDb", {
    resourceGroupName: config.resourceGroup.name,
    location: config.location,
    kind: "GlobalDocumentDB",
    offerType: "Standard",
    capabilities: [{name: "EnableGremlin"}],
    enableAutomaticFailover: false,
    enableMultipleWriteLocations: false,
    consistencyPolicy: {
        consistencyLevel: "Session",
        maxIntervalInSeconds: 5,
        maxStalenessPrefix: 100,
    },
    geoLocations: [
        {
            failoverPriority: 0,
            location: config.location,
        },
    ],
});

const gremlinDb = new azure.cosmosdb.GremlinDatabase("db", {
    resourceGroupName: cosmosDb.resourceGroupName,
    accountName: cosmosDb.name,
    throughput: 400,
});

export const gremlinGraph = new azure.cosmosdb.GremlinGraph("graph", {
    resourceGroupName: cosmosDb.resourceGroupName,
    accountName: cosmosDb.name,
    databaseName: gremlinDb.name,
    throughput: 400,
    conflictResolutionPolicies: [{
        conflictResolutionPath: "/_ts",
        mode: "LastWriterWins",
    }],
    indexPolicies: [{
        automatic: true,
        excludedPaths: ["/\"_etag\"/?"],
        includedPaths: ["/*"],
        indexingMode: "Consistent",
    }],
    partitionKeyPath: "/partkey",
});```

Glad it worked! Sorry for the incorrect information earlier