Unable to set upgrade policy to automatic during VMSS creation

[mimckitt]

Describe the bug

creating a new scale set using the following command is accepted but the upgrade policy mode is not actually set to automatic. It remains set to manual.

az vmss create
--resource-group myResourceGroup
--name myScaleSet
--image Ubuntu2204
--orchestration-mode Flexible
--upgrade-policy-mode Automatic
--admin-username azureuser
--generate-ssh-keys

Related command

az vmss create

Errors

No errors, upgrade policy is set to manual instead of automatic as it should be.

Issue script & Debug output

Logs are very long. I can send offline if needed.

Expected behavior

The upgrade policy of the scale set should be set to Automatic.

Environment Summary

Using Azure Cloud Shell

Additional context

Note, updating the upgrade policy to automatic works fine.

az vmss update
--name myScaleSet
--resource-group myResourceGroup
--set upgradePolicy.mode=Automatic

Seeing similar issue with create VMSS for PowerShell: Azure/azure-powershell#25301

[yonzhan]

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