In the report a Player section, there should be a sticky thread showing which games you're allowed to team in like this.
Allowed:
Solo Lucky Islands
Solo Skywars
Survival Games
All Arcade EXCEPT Hide & Seek
Kit PvP
Assassination
Not Allowed:
Team Lucky Islands
Tower Defense
Money Walls
Blockwars
Solo Eggwars
Team Eggwars
Hide & Seek
Team Skywars
UHC
Control Point
Allowed:
Solo Lucky Islands
Solo Skywars
Survival Games
All Arcade EXCEPT Hide & Seek
Kit PvP
Assassination
Not Allowed:
Team Lucky Islands
Tower Defense
Money Walls
Blockwars
Solo Eggwars
Team Eggwars
Hide & Seek
Team Skywars
UHC
Control Point