We have recently become aware that users have stated that the newly created outgoing streams are Active and Outgoing but the YT status remains Ready, not Live and the preview image remains blank
YouTube has reportedly introduced a restriction on the number of concurrent live streams allowed per stream key or channel. At this time, no official public announcement has been released. Users should confirm this update by reviewing their YouTube Channel or YouTube Studio settings.
At present, there is no clear indication regarding the maximum number of live concurrent streams that each channel can support simultaneously
you can refer here:
support.google.com
This article summarizes recent and past updates made to YouTube’s policies. For other updates relevant to YouTube creators, check out our Creator updates. Latest updates