can not create private endpoint for automation account

## Environment Summary
```
Linux-4.19.104-microsoft-standard-x86_64-with-glibc2.29, Ubuntu 20.04.4 LTS
Python 3.8.12
Installer: DEB

azure-cli 2.34.1 *

Extensions:
automation 0.1.1
azure-devops 0.18.0
aks-preview 0.5.14
aks-virtual-node 0.2.0
front-door 1.0.16

Dependencies:
msal 1.16.0
azure-mgmt-resource 20.0.0
```

When trying to create a private endpoint for an Automation Account i get an error message.

Steps :

export LOCAL="WestEurope"
export RGCOMMON="COMMON-RG"
export RGDEPLOY="DEPLOY-RG"
export ENVIR="PROD"
export ENVIRLOW=$(echo $ENVIR | tr '[:upper:]' '[:lower:]')
export DEFTAGS="ENV=$ENVIR"
export VNETDEPLOY="DEPLOY-VNET"

az automation account create --automation-account-name automation-account-$ENVIRLOW-$LOCAL -g $RGCOMMON --location $LOCAL --sku Basic --tags $DEFTAGS

export AUTOMATIONID=$(az resource show -g $RGCOMMON -n automation-account-$ENVIRLOW-$LOCAL --resource-type "Microsoft.Automation/AutomationAccounts" --query "id" -o tsv)

az network private-endpoint create --name automation-account-$ENVIRLOW-$LOCAL-PrivateEndpoint --resource-group $RGCOMMON \
--subnet /subscriptions/$SUBSCRIPTION/resourceGroups/$RGDEPLOY/providers/Microsoft.Network/virtualNetworks/$VNETDEPLOY/subnets/deploy-subnet \
--private-connection-resource-id $AUTOMATIONID \
--group-id Webhook --connection-name automation-account-$ENVIRLOW-$LOCAL-Connection --tags $DEFTAGS

(InternalServerError) Call to Microsoft.Automation/AutomationAccounts failed.
Code: InternalServerError
Message: Call to Microsoft.Automation/AutomationAccounts failed.

The Private Endpoint creation using Azure Portal is working OK