Embed code for a live stream is available when the stream is in Live Now state or Event Announcement has triggered.
Triggering Event Announcement
Event announcement is triggered at the set Event announcement time. By default, no event announcement is sent before going live. You can choose how long before the start of your stream you want to send the announcement from Advanced Settings in new stream section.
Event announcement must be set to trigger at least 15 min before the start of the live stream
Event announcement Setting

Live State
At the scheduled time, the stream will go live on your chosen social accounts and the state will change to Live Now.
How to get the embed code
Click Schedules tab on the left-hand sidebar.
Click the Get Embed Code green </> button and copy the code.

Example: YouTube Embed Code

NOTE: Embed code is not available for Facebook and Periscope
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Related Article:
How to set event announcement?
Triggering Event Announcement
Event announcement is triggered at the set Event announcement time. By default, no event announcement is sent before going live. You can choose how long before the start of your stream you want to send the announcement from Advanced Settings in new stream section.
Event announcement must be set to trigger at least 15 min before the start of the live stream
Event announcement Setting

Live State
At the scheduled time, the stream will go live on your chosen social accounts and the state will change to Live Now.
How to get the embed code
Click Schedules tab on the left-hand sidebar.
Click the Get Embed Code green </> button and copy the code.

Example: YouTube Embed Code

NOTE: Embed code is not available for Facebook and Periscope
.............................................................................................................................................................................................................................................................
Related Article:
How to set event announcement?