On speaker devices that don't support APL, the current sample will fail with "...there is a problem with the skill response...". Instead, the sample should detect APL support on a device and if it isn't found, provide a reasonable failover experience explaining that the sample is meant for a multimodal Alexa device.
Repo maintainer(s), please see alexa-labs/skill-sample-nodejs-firetv-vlogs#3 for how to fix this issue.