access to azure blob storage using filedatastore no longer works

I am having difficulty accessing azure blob storage using

Location='wasbs://[e-mail]/FILEPATH'

ds = fileDatastore(Location,'ReadFcn', @load, 'FileExtensions',Extension )

I keep getting the error:

Cannot find files or folders matching: 'wasbs://[e-mail]/FILEPATH'

this is confusing for me as the files and folders definitly exist. and this function has worked in the past. I have set the MW_WASB_SECRET_KEY and MW_WASB_SAS_TOKEN Keys environment variables correctly.