Error: credentials must be one of: ApplicationTokenCredentials, UserTokenCredentials, DeviceTokenCredentials, MSITokenCredentials

[azure-samples]

Error: credentials must be one of: ApplicationTokenCredentials, UserTokenCredentials, DeviceTokenCredentials, MSITokenCredentials

[workfigure]

I found out temporary solution.
The problem is that
at line 54-68 of file /node_modules/azure-keyvault/node_modules/ms-rest-azure/lib/credentials/keyVaultCredentials.js, there is type comparison and it is the one causing the error. The object I am getting from the call msRestAzure.loginWithAppServiceMSI is MSIAppServiceTokenCredentials and I created this object by require('ms-rest-azure') but the object the azure-keyvault is comparing using the instance it loads by require('ms-rest-azure'). So the instance I created is not the same type of the azure-keyvault created even-if the node module is the same copy.

Here is the temporary solution to get key/secret from key vault.
First expose the msRestAzure from the azure-keyvault node module. To do that update the node_modules/azure-keyvault/lib/keyVault.js file with this one line code.
module.exports.msRestAzure = msRestAzure;

Then the method look like this:

const KeyVault = require('azure-keyvault');
var getKeyValue = async (secretName, secretVersion)=>{
// The ms-rest-azure library allows us to login with MSI by providing the resource name. In this case the resource is Key Vault.
return KeyVault.msRestAzure.loginWithAppServiceMSI({resource: 'https://vault.azure.net'})
.then((credentials) => {
var vaultUri = "https://.vault.azure.net/";
const client = new KeyVault.KeyVaultClient(credentials);
return client.getSecret(vaultUri, secretName, secretVersion)
.then((result) => {
return result.value;
})
.catch((err)=>{
console.log(err);
return err;
});
})
.catch((err)=>{
console.log(err);
return err;
});
};

[jongio]

This should be resolved in latest update. Please reopen if you are able to repro. Thank you