Hello, @aaronbradford
Welcome to the HiveMQ community!
It looks like, based on the address you’ve provided, that you are currently using a Cloud instance. Typically, with the cloud instance, the server CA file can be utilized for TLS connectivity, and is available through our FAQ post here.
Could you provide which MQTT client you are looking to use? These clients typically provide documentation for different variations of TLS implementation, including server .pem files.
Best,
Aaron from the HiveMQ Team