How to set custom domain name on Cloud Serverless?

Currently, using a custom domain name, or a hostname different from the assigned cluster URL, is available for users on the 'Starter' tier or above within HiveMQ Cloud products. Therefore, opting for a common name instead of the cluster URL for connections on the serverless (free) tier might not provide the full functionality as anticipated.

The exact differences between tiers can be seen on our pricing page, available here.