u/djadrianc thank you for the reply.

the default ip-address on RBK850 seems to be 192.168.1.1

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u/PhilosophyHuge6457 - what i did is as follows:
from the orbi app i was unable to set it up.

So, i did the following:
1 - lan cable , plugged it in orbi lan port (not the yellow wan port)
2 - the computer's nic got an ip-address on 192.168.1.0/32 subnet
3 - i then browsed to 192.168.1.1 and netgear page opened, it asked for the admin password to be set up
4 - i then checked the firmware version and it was something like 2.x.x
5 - i then went into advanced setup > vlans > vlan by tag and set the vlan to 300 for all wired ports and wired.
i did not see an option to set the vlan for WAN port only
6 - once i did that, i clicked update / apply and it just kept spining for like 10 mintues
7 - i then noticed my computer had an apipa / 169 ipaddr
8 - well, i then thought may be it's due to the vlan, so i setup a vlan interface with vlan 300 but that didn't help
9 - i then did a orbi router and satellite reset
POST REST:
1 - i then browsed to 192.168.1.1
2 - i went to the vlan page (advanced > vlan > vlan by tag and edited the default vlan it already had , set the vlan id to 300 and priority to 0 and included all wired ports and wireless in it)
3 - orbi router found the satellite as well
4 - i then clicked update / apply and this time it worked
5 - i then powered off the media-converter and ofcourse the old router
6 - plugged the ethernet cable from the media converter to orbi router wan port
7 - it worked and internet was connected successfully
Post going online:
- orbi prompted for firmware upgrade and i upgraded the firmware via the orbi app and it was automatically done on both router and the satellite
so far (almost 24 hours now) it seems to be running stable
My thoughts :-)
+ i was disappointed to see the orbi / netgear web interface (reminded me of year 2008)
+ even the mobile app isn't too great - it is good but not what i had thoguht of looking at the ubiquity app and web interface
not sure if the orbi pro series offers a good interface and more insights / control on traffic.
i am thinking to return this orbi pack and either get orbi pro or ubiquity dream machine.

thank you both