Create it in the same region as the media services account being migrated.
az group create --location location --name migration
The parameters for the deployment are in the file parameters.bicepparam.
// The media account being migrated.
param mediaAccountName = 'accountname'
param mediaAccountRG = 'resourcegroup'
// The storage account details where the migrated data is written.
param storageAccountName = 'storeagaccountname'
param storageAccountRG = 'storageresourcegroup'
az deployment group create --template-file deployment.bicep --resource-group migration --parameters parameters.bicepparam
While the ACI is running you can monitor the progress of the tool by running.
az container logs --follow -g migration -n azure-media-migration