command 'az timeseriesinsights'= 'CommandNotFoundError: 'timeseriesinsights' is misspelled or not recognized by the system.'

On page: https://docs.microsoft.com/en-us/learn/modules/develop-with-azure-digital-twins/route-output-from-azure-digital-twins-to-downstream-services/6-exercise-visualize-data-time-series-insights

It has you run the command
```
$storage="adtholtsitorage"+(get-random -maximum 10000)
$tsiname=$random+"tsienv"
az storage account create -g $rgname -n $storage --https-only -l $location
$key=$(az storage account keys list -g $rgname -n $storage --query [0].value --output tsv)
az timeseriesinsights environment longterm create -g $rgname -n $tsiname --location $location --sku-name L1 --sku-capacity 1 --data-retention 7 --time-series-id-properties '$dtId' --storage-account-name $storage --storage-management-key $key -l $location
```

but ```az timeseriesinsights``` does not seem to work.