Choosing a specific folder as source down in Azure Blob storage folder hierarchy

HI all:

One question : I am trying to read json files from a particular folder (9 levels deep) in Azure Blob storage folder. -In other words, it is not a root folder-

I tried

1) Fiddling with

Source = AzureStorage.Blobs("https://storageaccount.blob.core.windows.net:443"),
#"alldata" = Source{[Name="rootfolderinblobstorage/folder1/folder2/Desiredfolder"]}[Data],

this threw an error stating that the path was not representing a valid azure resource ...

2) so I tried "ok, get everything -inefficient- , and filter locally"

#"Filtered Rows" = Table.SelectRows(#"alldata", each Text.StartsWith([Name], "/folder1/folder2/Desiredfolder"))
in
#"Filtered Rows"

but this threw an "access to the resource is forbidden" message and asked me for the token again (providing it does nothing and the message persists)

Any ideas anyone? Am I missing something totally obvious?

Thank you all!

Alejandro Leguizamo