gcloud alpha resource-manager tags values set-iam-policy

INFORMATION
gcloud alpha resource-manager tags values set-iam-policy is supported in universe domain universe; however, some of the values used in the help text may not be available. Command examples may not work as-is and may requires changes before execution.
NAME
gcloud alpha resource-manager tags values set-iam-policy - sets IAM policy for a TagValue resource
SYNOPSIS
gcloud alpha resource-manager tags values set-iam-policy RESOURCE_NAME POLICY_FILE [GCLOUD_WIDE_FLAG …]
DESCRIPTION
(ALPHA) Sets the IAM policy for a TagValue resource given the TagValue's short name name and parent or the TagValue's numeric id and a file encoded in JSON or YAML that contains the IAM policy.
EXAMPLES
To set the IAM policy for a TagValue with id '111' and IAM policy defined in a YAML file '/path/to/my_policy.yaml', run: 
gcloud alpha resource-manager tags values set-iam-policy tagValues/111 /path/to/my_policy.yaml

To set the IAM policy for a tagValue with the short_name 'dev' under 'organization/456' and tag key short name 'env' and IAM policy defined in a JSON file '/path/to/my_policy.json', run: 

gcloud alpha resource-manager tags values set-iam-policy 456/env/dev /path/to/my_policy.json
POSITIONAL ARGUMENTS
RESOURCE_NAME
Resource name or namespaced name. The resource name should be in the form {resource_type}/{numeric_id}. The namespaced name should be in the form {org_id}/{short_name} where short_name must be 1-63 characters, beginning and ending with an alphanumeric character ([a-z0-9A-Z]) with dashes (-), underscores ( _ ), dots (.), and alphanumerics between.
POLICY_FILE
Path to a local JSON or YAML formatted file containing a valid policy. The output of the get-iam-policy command is a valid file, as is any JSON or YAML file conforming to the structure of a Policy.
GCLOUD WIDE FLAGS
These flags are available to all commands: --access-token-file, --account, --billing-project, --configuration, --flags-file, --flatten, --format, --help, --impersonate-service-account, --log-http, --project, --quiet, --trace-token, --user-output-enabled, --verbosity.

Run $ gcloud help for details.

NOTES
This command is currently in alpha and might change without notice. If this command fails with API permission errors despite specifying the correct project, you might be trying to access an API with an invitation-only early access allowlist. These variants are also available: 
gcloud resource-manager tags values set-iam-policy
 
gcloud beta resource-manager tags values set-iam-policy