Azure-mgmt-monitor credential can't get token

[dommgifer]

• Package Name:
  azure-mgmt-monitor

• Package Version:
  1.0.1

• Operating System:
  Ubuntu 18.04

• Python Version:
  3.7

Describe the bug
I want to get VM CPU usage,
So I run MonitorClient(credentials, subscription_id).metrics.list()

But get error message:

AttributeError
'coroutine' object has no attribute 'token'

To Reproduce
Steps to reproduce the behavior:

1. Install package
   azure-identity==1.4.0
   azure-core==1.8.1
   azure-mgmt-monitor==1.0.1

2. My credentials from ServicePrincipalCredentials

from azure.common.credentials import ServicePrincipalCredentials
credentials = ServicePrincipalCredentials(
           tenant = tenant_id,
           client_id= app_id,
           secret = password
        )

3. Get monitor_client

from azure.mgmt.monitor import MonitorClient
monitor_client = MonitorClient(credentials, subscription_id)

4. Call metrics.list()

metrics_data = monitor_client.metrics.list(
            resource_id,
            timespan="{}/{}".format('2020-09-25T00:00:00', '2020-09-25T02:00:00'),
            interval='PT1M',
            metricnames='Percentage CPU',
            aggregation='Average'
        )

5. Get Error

AttributeError
'ServicePrincipalCredentials' object has no attribute 'get_token'

6. Change credentials from ClientSecretCredential
   Reference by azure-mgmt-monitor/tests/test_cli_mgmt_monitor.py

from azure.identity.aio import ClientSecretCredential
credentials = ClientSecretCredential(
            tenant = tenant_id,
           client_id= app_id,
           secret = password
        )

7. Run same code in step 2 and 3 again, Get error

AttributeError
'coroutine' object has no attribute 'token'

Expected behavior
Get VM CPU usage

Screenshots
If applicable, add screenshots to help explain your problem.

Additional context
All my code:

from azure.mgmt.monitor import MonitorClient
from azure.identity.aio import ClientSecretCredential
credentials = ClientSecretCredential(
            tenant = tenant_id,
           client_id= app_id,
           secret = password
        )

monitor_client = MonitorClient(credentials, subscription_id)
metrics_data = monitor_client.metrics.list(
            resource_id,
            timespan="{}/{}".format('2020-09-25T00:00:00', '2020-09-25T02:00:00'),
            interval='PT1M',
            metricnames='Percentage CPU',
            aggregation='Average'
        )

[dommgifer]

I found this doc

use from azure.identity import ClientSecretCredential and It work.