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This is in message ?templates in Portrait Dialogue.
Offers are linked to marketing activities in the planning step of setting up a campaign in HQ.
To see who will get a certain offer you'll have to look in the design tab to see which audience or visual dialogue is linked to it.
In case a visual dialogue is linked, you'll have to open the dialogue in Visual Dialogue and look in the dialog design which audience or target group has been attached to the different steps in the dialogue.
Hope this helps.