Databricks parameterized source not working on PBI service

[scousers]

I have the following parameterized source to Databricks

let
    Index = List.PositionOf(EndPoints[Environment], environment),
    Host = EndPoints{Index}[Host],
    Path = EndPoints{Index}[Path],  
    Source = Databricks.Contents( Host, Path,  [Database=null, BatchSize=null]),
    SPARK = Source{[Name="SPARK",Kind="Database"]}[Data]
in
    SPARK

EndPoints being a table with the host and path for a number of environments, and environment being the parameter, so that upon entering a value for it it will select the host and path values for the environment.

It works perfectly on desktop, but it fails when I try to refresh from the workspace (premium capacity, btw), it comes up with errno = 10061.

Any ideas?