Are you using prepackaged streams?

This applies if you're delivering your streams from prepackaged files, as opposed to presegmented files.

For example, if your content is comprised of contiguous fragmented MP4 files, and not individual MP4 chunks (such as content transcoded via the MSOD: Content Preparation product), you’ll need to append the pkz=1 query parameter to the playback URL:

Prepackaged DASH streams

To implement support for pre-packaged DASH content, implement the steps in Dynamic Adaptive Streaming for HTTP (DASH) via DASH.js.