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Unable to update or set tags for multiple resource IDs

See original GitHub issue

Describe the bug

Command name: az resource update

Errors:

Couldn't find 'tags' in ''. Available options: index into the collection '' with [<index>] or [<key=value>]

To Reproduce:

Try to set or update tags for multiple resource IDs at once.

> az group create --location westeurope --name rg-test-1
{
  "id": "/subscriptions/<subscription ID>/resourceGroups/rg-test-1",
  "location": "westeurope",
  "managedBy": null,
  "name": "rg-test-1",
  "properties": {
    "provisioningState": "Succeeded"
  },
  "tags": null,
  "type": "Microsoft.Resources/resourceGroups"
}

> az group create --location westeurope --name rg-test-2
{
  "id": "/subscriptions/<subscription ID>/resourceGroups/rg-test-2",
  "location": "westeurope",
  "managedBy": null,
  "name": "rg-test-2",
  "properties": {
    "provisioningState": "Succeeded"
  },
  "tags": null,
  "type": "Microsoft.Resources/resourceGroups"
}

> az resource update --ids /subscriptions/<subscription ID>/resourceGroups/rg-test-1 /subscriptions/<subscription ID>/resourceGroups/rg-test-2 --set tags.test=value
Couldn't find 'tags' in ''. Available options: index into the collection '' with [<index>] or [<key=value>]

Expected Behavior

Environment Summary

Linux-5.8.6-201.fc32.x86_64-x86_64-with-glibc2.2.5
Python 3.8.5
Installer: PIP

azure-cli 2.11.1

Additional Context

I tested this with snapshots, virtual machines, and resource groups. It doesn’t seem to matter whether the tags already exists or not, whether the IDs are surrounded by quotes, whether the --set portion is surrounded by quotes, whether --set is specified multiple times (for multiple tags); it will still fail.