Azure Automation Assign Capacity using Managed Identity

[kpia]

Hi,

I am trying to automate the assigment of PBI capacity using Azure Automation. I continue to get a 401 error went trying to assing a workspace to my capacity. I added a the managed identity as a Power BI Capacity Administrator in Azure but continue to get this error. 

The managed identity is added to the workspace and I can assign premimum capacity without any issues. Not sure what authorizations I am missing. Any help is greatly appreciated.