Azure Cost Consumption Error Converting to Table

Hi, 

I created a report in Power BI using the Azure Cost Management (Beta) as a datasource. The report uses multiple Enterprise Keys and combines them in Query Editor to make a single data source. The report has been active for a few months and has worked fine but recently I am getting the error (both in the service and on desktop) that refresh fails as "We cannot convert the value "Error occurred. EA:..." to type Table.".

Does anyone know why this error is occuring and how I can fix it please?

Thanks in advance, 

Vav