Possible to join TMM team when already in game/match launching state.

**Describe the bug**
When you invite someone before you search, they can accept after/while searching. We had a friend joining our team while we just found a match.

**To Reproduce**
Send invite, wait until match found and let other player accept the invite at that moment.

**Log or error message**
This is my log file:

**Expected behavior**
An error notification on the joining player's side that says something along the lines of "This team is already in the queue / already playing"

**Screenshots**
If applicable, add screenshots to help explain your problem.

**OS**
Linux or Windows

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