### Answer
Sorry, I wasn't able to find any specific information in the documentation about the error message you're encountering related to "Subscription to TrackSubscriptionKey ...cam-audio" when using Vapi with Python. This error appears to be related to media subscription issues, possibly due to configuration or network problems, but without direct context from the official resources, I can't provide a definitive answer. For detailed assistance, it might be beneficial to check the official Vapi API documentation or reach out to their support team.