Unable to load extension 'bastion: No module named msrestazure'

[eliassal]

Describe the bug

I am trying to run
az peering peering list --ResourceGroupG "deve-vnet"

I get
C:\Users\s.....azure\cliextensions\azure-devops\azext_devops\dev_init_.py:5: UserWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html. The pkg_resources package is slated for removal as early as 2025-11-30. Refrain from using this package or pin to Setuptools<81.
import pkg_resources
Unable to load extension 'bastion: No module named 'msrestazure''. Use --debug for more information.

Related command

az peering peering list

Errors

C:\Users\s.....azure\cliextensions\azure-devops\azext_devops\dev_init_.py:5: UserWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html. The pkg_resources package is slated for removal as early as 2025-11-30. Refrain from using this package or pin to Setuptools<81.
import pkg_resources
Unable to load extension 'bastion: No module named 'msrestazure''. Use --debug for more information.

Issue script & Debug output

C:\Users\s.....azure\cliextensions\azure-devops\azext_devops\dev_init_.py:5: UserWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html. The pkg_resources package is slated for removal as early as 2025-11-30. Refrain from using this package or pin to Setuptools<81.
import pkg_resources
Unable to load extension 'bastion: No module named 'msrestazure''. Use --debug for more information.

Expected behavior

Get a list of peerings inside a resource group

Environment Summary

azure-cli 2.75.0

core 2.75.0
telemetry 1.1.0

Extensions:
account 0.2.5
automation 1.0.0b1
azure-devops 1.0.0
bastion 0.3.0
containerapp 1.1.0b2
interactive 0.5.3
next 0.1.3
resource-graph 2.1.0
spring-cloud 3.1.8
storage-preview 1.0.0b1

Dependencies:
msal 1.33.0b1
azure-mgmt-resource 23.3.0

Python location 'C:\Program Files\Microsoft SDKs\Azure\CLI2\python.exe'
Config directory 'C:\Users\salam.SALAM.azure'
Extensions directory 'C:\Users\salam.SALAM.azure\cliextensions'

Python (Windows) 3.12.10 (tags/v3.12.10:0cc8128, Apr 8 2025, 12:21:36) [MSC v.1943 64 bit (AMD64)]

Legal docs and information: aka.ms/AzureCliLegal

Your CLI is up-to-date.

Additional context

No response

[yonzhan]

Thank you for opening this issue, we will look into it.

[u023871]

Hi! I had an equal error with an az ssh login...

az ssh vm -n MYHOST -g rg_westeurope_something --port 2022 --subscription MYSUB --prefer-private-ip The command failed with an unexpected error. Here is the traceback: No module named 'msrestazure' ...

I upgraded the SSH extension and then it worked. Maybe you need to upgrade your extensions, too... although I do not know which extension includes the "peering" command.
EDIT: Seems to be your "bastion" extension maybe...

I did:
az extension remove --name ssh
az extension add --name ssh

Cheers and GL!

[eliassal]

neither me! I have just installed the peering module which I should think it is the most recent one

[andyzhangx]

I think the built-in cli extension is broken, and after reinstall the cli extension, it works.

[rjhornsby]

2026 and this is still a problem for commands completely unrelated to ssh or any other specific resource, like try to get az to use gov:

╰─± az cloud set --name AzureUSGovernment
Unable to load extension 'bastion: No module named 'msrestazure''. Use --debug for more information.

Reinstalling the ssh extension made no difference:

╰─± az extension remove --name ssh
╰─± az extension add --name ssh
Unable to load extension 'bastion: No module named 'msrestazure''. Use --debug for more information.
╰─± az cloud set --name AzureUSGovernment
Unable to load extension 'bastion: No module named 'msrestazure''. Use --debug for more information.

Removed az cli 2.85.0 and that seemed to clear the error:

╰─± brew remove azure-cli
Uninstalling /opt/homebrew/Cellar/azure-cli/2.85.0... (16,047 files, 348.4MB)
╰─± brew cleanup
...
╰─± brew install azure-cli
...
╰─± az cloud set --name AzureUSGovernment
(no output)