Hi Joshua,
Try adding the --include-private-policies option. The base path is hidden from general users, so you need to be an administrator, and use the --include-private-policies option to display it.
(You can tell it’s a private field by checking https://docs.globus.org/globus-connect-server/v5.4/api/schemas/Collection_1_2_0_schema/: The collection_base_path field is marked Private, and the API call https://docs.globus.org/globus-connect-server/v5.4/api/openapi_Collections/#listCollections says that Collection Administrator access is required to see the information.)
~ Karl
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