This article explains that you cannot pick a team more than once and that picks are reset at the beginning of the playoffs.

While you are an Active member of an individual group, you cannot pick the same professional football team more than once during the regular season. As teams are selected each week, they're removed as future pick options.

In groups that pick through the playoffs, team restrictions will be reset at the beginning of the playoffs, and you will again be able to pick each team once.

Please note: If you have previously selected both teams involved in the Super Bowl, either in the Wildcard, Division or Conference Championship game, you will not be able to select either team again in the Super Bowl.

If a Private Group commissioner elects to restart his or her group, all previous pick selections are cleared out and each of the professional teams is once again available for selection.