By preceding my topic with an underscore, e.g. _configuration, the AVRO _configuration-key, and _configuration-value schemas were ignored, and my topic was displayed as binary. After renaming it to configuration (and subsequent schema files, configuration-key and configuration-value), the AVRO messages were displayed correctly.
By preceding my topic with an underscore, e.g. _configuration, the AVRO _configuration-key, and _configuration-value schemas were ignored, and my topic was displayed as binary. After renaming it to configuration (and subsequent schema files, configuration-key and configuration-value), the AVRO messages were displayed correctly.