If you utilize an HTTPS Proxy Server, and you choose to use TCP/443 (or TCP/80) as the agent address port for the Jazz Edge Node, you will likely see that the enrollment failures. This is due to the Proxy Server anchoring the connection, and preventing direct TLS communication from agent getting through.
Most proxy servers have an option to bypass the proxy (pass-through), using a filter. Whether the decision is made to white-list the Jazz Edge Node (e.g. edge.jazz.company.com), or set a less specific encompassing rule (e.g. *.jazz.company.com), this should allow for the agents to successfully enroll and pass data.
Another option is to use different ports for Jazz Edge Node connections (e.g. TCP/3006), and thus bypass the Proxy completely. Doing so after initial deployment will require re-deploying the Edge Node, and creating new certificate bundles for enrollment.
If the above does not resolve your issue, please raise a case with Jazz Networks support (https://support.jazznetworks.com).