You are trying to join a different BG for attack than the one in which you have placed defenders. -or- you are trying to use champs that are in either of the +/- “potential” Tier Maps (even if they are not the defenders that are being used in your “current tier map”, the other Tier ones can also NOT be used for attack or for AQ).
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-or- you are trying to use champs that are in either of the +/- “potential” Tier Maps (even if they are not the defenders that are being used in your “current tier map”, the other Tier ones can also NOT be used for attack or for AQ).