I know this is a very late reply to the message, but replying as the new expansion is out and I was still having the same issue as I did with the main game, except this time my friend isn’t playing it.
The appearing online and offline, made absolutely no difference to me. I have really good internet and NAT type. I never could find anything other than people saying that appearing offline could be the problem.
Since starting the new DLC I have had the same issue, and as my buddy is not playing it and I had to really look into it yesterday, and found one post on gamefaqs that sorted it out straight away. My Privacy settings has always been on custom.
Gamefaqs post by diru990: https://gamefaqs.gamespot.com/boards/211370-monster-hunter-world/77318402
The game is not dead at all. There is a very big issue with matchmaking that not a lot of people know about.
Here is your fix:
- hit the Xbox button on the controller
- click your profile name on the far left tab
- go to My Profile
- go to Privacy settings
- change it to adult/adult defaults
Now people will be able to join your SOS.
Worked on my first sos after changing privacy settings