az policy assignment issues

[dilip-yadav05-deloitte]

This is autogenerated. Please review and update as needed.

Describe the bug

Command Name
a ![error](https://user-images.githubusercontent.com/110810895/193546932-9cee9635-43ef-4f62-9488-f591546aa677.png) z policy assignment create

Errors:

APIVersion 2019-09-01 is not available
Traceback (most recent call last):
python3/dist-packages/knack/cli.py, ln 206, in invoke
    cmd_result = self.invocation.execute(args)
cli/core/commands/__init__.py, ln 608, in execute
    raise ex
cli/core/commands/__init__.py, ln 666, in _run_jobs_serially
    results.append(self._run_job(expanded_arg, cmd_copy))
cli/core/commands/__init__.py, ln 659, in _run_job
    six.reraise(*sys.exc_info())
...
cli/command_modules/resource/custom.py, ln 632, in _get_custom_or_builtin_policy
    policy_operations = client.policy_set_definitions if for_policy_set else client.policy_definitions
mgmt/resource/policy/_policy_client.py, ln 175, in policy_definitions
    raise NotImplementedError("APIVersion {} is not available".format(api_version))
NotImplementedError: APIVersion 2019-09-01 is not available

To Reproduce:

Steps to reproduce the behavior. Note that argument values have been redacted, as they may contain sensitive information.

• Put any pre-requisite steps here...
• az policy assignment create --name {} --display-name {} --scope {} --policy {}

Expected Behavior

Environment Summary

Linux-5.14.0-1051-oem-x86_64-with-glibc2.29
Python 3.8.10
Shell: bash

azure-cli 2.0.81

Additional Context

[yonzhan]

@zhoxing-ms for awareness