gcloud alpha iam service-accounts sign-jwt

INFORMATION
gcloud alpha iam service-accounts sign-jwt 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 iam service-accounts sign-jwt - sign a JWT with a managed service account key
SYNOPSIS
gcloud alpha iam service-accounts sign-jwt INPUT-FILE OUTPUT-FILE --iam-account=IAM_ACCOUNT [GCLOUD_WIDE_FLAG …]
DESCRIPTION
(ALPHA) This command signs a JWT using a system-managed service account key.

If the service account does not exist, this command returns a PERMISSION_DENIED error.

EXAMPLES
To create a sign JWT with a system-managed service account key, run: 
gcloud alpha iam service-accounts sign-jwt --iam-account=my-iam-account@my-project.iam.gserviceaccount.com input.json output.jwt
POSITIONAL ARGUMENTS
INPUT-FILE
A path to the file containing the JSON JWT Claim set to be signed.
OUTPUT-FILE
A path the resulting signed JWT will be written to.
REQUIRED FLAGS
--iam-account=IAM_ACCOUNT
The service account to sign as.
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.

SEE ALSO
For more information on how this command ties into the wider cloud infrastructure, please see https://cloud.google.com/appengine/docs/java/appidentity/.
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 iam service-accounts sign-jwt
 
gcloud beta iam service-accounts sign-jwt