Cannot live stream using latest Kaltura CE

I am trying to test the live streaming capabilities of the latest Kaltura CE.
The list of packages I have installed on a clean setup of Ubuntu 16.04 Xenial is:

root@kaltura:/opt/kaltura/nginx/conf# dpkg -l|grep kaltura
ii  kaltura-base                        13.9.0-2+b2                                all          Kaltura Open Source Video Platform
ii  kaltura-batch                       13.9.0-1+b1                                all          Kaltura Open Source Video Platform - batch server
ii  kaltura-clipapp                     1.3-1+b2                                   all          Kaltura Video Presentations Manager
ii  kaltura-db                          12.15.0-1+b7                               all          Kaltura Open Source Video Platform - batch server
ii  kaltura-dwh                         12.14.0-1+b2                               amd64        Kaltura Open Source Video Platform - Analytics
ii  kaltura-ffmpeg                      3.2-3                                      amd64
ii  kaltura-ffmpeg-aux                  2.1.3-1                                    amd64
ii  kaltura-flexwrapper                 1.2-1+b1                                   all          Kaltura Video Presentations Manager
ii  kaltura-front                       13.9.0-1+b1                                all          Kaltura Open Source Video Platform - frontend server
ii  kaltura-html5-studio                2.1.0-1                                    all          Kaltura Open Source Video Platform - frontend server
ii  kaltura-html5lib                    2.64-1+b1                                  all          Kaltura Open Source Video Platform - HTML5 player
ii  kaltura-kclip                       1.1.2.1-1                                  all          Kaltura Video Presentations Manager
ii  kaltura-kcw                         2.2.4-1+b6                                 all          Kalture Contribution Wizard
ii  kaltura-kdp                         2.7.0-1+b1                                 all          Kaltura Dynamic Player
ii  kaltura-kdp3                        3.9.9-1+b4                                 amd64        Kaltura Dynamic Player
ii  kaltura-kdp3wrapper                 37-1+b3                                    all          KDP3 Wrapper
ii  kaltura-kdpwrapper                  11-1+b2                                    all          KDP Wrapper
ii  kaltura-kmc                         5.43.9-1                                   all          Kaltura Management Console
ii  kaltura-krecord                     1.7-1+b1                                   all          Kaltura kRecord - used for recording from web cam
ii  kaltura-kupload                     1.2.16-1+b2                                all          Kaltura kupload widget
ii  kaltura-nginx                       1.12.2-3+b7                                amd64        Nginx web/proxy server - for Kaltura
ii  kaltura-pentaho                     4.2.1+b2                                   amd64        Pentaho Open Source Data Integration Community Edition (CE).
ii  kaltura-postinst                    1.0.33-3+b6                                all          Kaltura Open Source Video Platform
ii  kaltura-sphinx                      2.2.1-4+b3                                 amd64        Sphinx full-text search server - for Kaltura
ii  kaltura-widgets                     10.9.0-1+b7                                all          Kaltura Open Source Video Platform - widgets meta package

I set-up the live entry in the KMC with the first option for Live Streaming Type: Kaltura Live Streaming (HDS/HLS/DASH). In the Live Stream section I have the primary URL with the value: rtmp://@PRIMARY_MEDIA_SERVER_HOST@:@PRIMARY_MEDIA_SERVER_PORT@/kLive/?p=100&e=0_dosbbbjw&i=0&t=6e2124eb and the Stream Name 0_dosbbbjw_1

I configured OBS with corresponding URL and stream key:
I had to configure port 1936, as configured in the kaltura-nginx configuration.

The OBS connects and streams correctly, as the green indicator apears on the interface. However either on the entry edit form or in the preview&embed form there is no playback possible:

kmc_preview.png1775x935 62.2 KB

I searched intensively the configuration files trying to figure it out if there is something wrong with the configs but nothing came up.
I checked in the admin console for permissions for the user I connect with to the KMC and enabled all settings related to live streaming.
Am I doing something wrong?

Thank you for any help.

Regards,
Dan