Organisation Account Data Connection not working after publishing

Hi There,

I have a Power BI Desktop file which connects to source data located in Sharepoint (via Organisational Account) and everything is working fine.

However, when I publish it to Power BI Workspace, the connection seems to be disappearing. I go to my datasource settings and under Data Source Credentials it says:

"Your data source can't be refreshed because the credentials are invalid. Please update your credentials and try again."

I click 'Edit Credentials' and the only options in the drop down list are Windows, Basic and Anonymous.

I've tried all three and none of them are working, instead I get the error: "Failed to update data source credentials:"

I believe there should be an organisational option in the drop down but there's nothing there... any ideas?

Thankyou!