How do I return a board to a team?

[Jonesy]

I opened up the board settings, and out of curiosity, clicked the team the board is connected to under the Change Team... option.  This removed the team association to the board and turned the board into a private board.  I want to return the board to visible to a team.  How do I do that?  When I went back to settings there's no option to associate the board to a team.  And looking at the Private button on the board, the option to choose visibility to a team is greyed out.

[Thierry]

same for me but conversely : 

read this question

Add a personal board without adding it to a team?

... !