Hi there!
You have to upgrade the lure to use raid banners inside Hunts.
The raid banner can then be placed before the boss room.
English
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My lure is maxed and I unlocked the season rank reward that allows placement of the banners last season
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I haven't played a hunt this season. Maybe exactly this is the problem. The raid banner was a buff in the season pass. Since the season pass isn't active anymore it is likely that you're unable to place a banner.
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I was able to place a banner last week before the reset this Tuesday