I've noticed that I never get matchmade into any fireteams when trying to do any strikes. Tried the current weekly and the Level 26 Summoning Pits one and didn't get matchmade into any fireteams. What happens is that I select a strike then select Launch. It then dives me straight into the strike solo without searching for an open fireteam slot. This is happening with the PS4 version for me. If anyone else is seeing this on other platforms, please chime in.