Found a SOLUTION and FIXED this ERROR , but this need to be FIXED so please contact GeForce and tell them .

To fix this problem, you need to follow these steps strictly:

1. Running Far Cry 6 from GFN.
2. Ubisoft Connect log screen will appear (make sure you have 2-steps verification enabled)
3. Fill up your login informations , wait for verification screen to enter code but do not confirm
4. Go back , Click on "Change user" and then "Recover password".
5. The browser should ope -> in the address bar enter: uplay://open (repeat multiple times until the pop-up will show up)
6. A confirmation window will appear. DO NOT CLICK ON THE CONFIRMATION YET
7. Close first a window with authorization in Ubisoft Connect (Default from GFN) and FAST click on the confirmation in the browser (pop up)
8. Next, log in Ubisoft Connect, as usual, and we should open the launcher with full functionality.
9. Run the game from the launcher Ubisoft Connect and there is no error to connect friends!

Do everything exactly as I described and everything will be ok.
If a friend disconnects while the world is loading, just invite him into the party already inside the world.
This method works and was confirmed right now

(Credit : Reddit u/mxmalykhin)

@danners_b UP ^
I found that could be issue with GFN as well.
I cannot see anyone online even if they are in game next to me. And then I can AORAKI-190 Error

I'm having this error code (AORAKI-190) while trying to play with my friend which is on GFN (Ge-Force NOW) and me on the PC.
Can't resolve this bug , been watching over reddit and GFN forums, multiple error bugs were reported. Ain't single problem .
Nothing helps, tried everything. We are not in any operation mode and have empty missions.
Thank You for fixing that ?