How to enable partition key delete feature for my Azure cosmos account?

var deleteResponse = await container.DeleteAllItemsByPartitionKeyStreamAsync(new PartitionKey(partitionKey));

I have used this code snippet from referring - https://video2.skills-academy.com/en-us/azure/cosmos-db/nosql/how-to-delete-by-partition-key?tabs=dotnet-example

Getting exception: Message: {"Errors":["Partition key delete feature is disabled for this account. Please contact Azure Support [https://azure.microsoft.com/support] to enable it."]}