As I explained to you here: https://github.com/kaltura/server/issues/6787 , the Nginx host needs to be accessible from all devices you intend to play the media from. If it is not, then you need to correct that.
mysql> select * from delivery_profile where id in (1001,1002,1003)\G
Are the values for host_name and url correct?
Once again, an explanation of how this works, including a full configuration review, is available here: