Dataverse not available as a data source in Power Query online

Hi - in the past I have connected directly to Dataverse in Power Query online to set up Dataflows. Also the official help shows this is possible here: https://learn.microsoft.com/en-us/power-query/connectors/dataverse

However today I have tried to create a new Dataflow in the service, and there is no option to choose Dataverse as a source? 

Any help would be great. Thanks, Joe