I cannot seem to create schema-level permissions in Babelfish

Please check updates for the latest version of Babelfish. As of July 2022, Babelfish version 2.1.1 does not have a way to grant permissions to the schema level. For now, the best practice is to create a database role like db_reader and then add your users to that role. Then, you can do the grant select statements for each table in your schema.