Usually the campaign window is not open yet in the campaign's own time zone, the campaign is paused, or, for a share-link campaign, the store was opened without the link.
Check these in order
Is the window actually open right now, in the campaign's own time zone?
Is the campaign marked active?
For a share-link campaign, did you open the link itself?
Visiting the store directly will not apply it, which is the whole point of that audience setting.
How to fix it
In Event Campaigns, edit the campaign's start and end times, or Resume a paused campaign. Changes take effect within about a minute. For a share-link campaign, use Copy link and open that exact link in a private window.
If it still is not working
Send us the order number and the customer's tag through Still stuck, and we will read the checkout function's own run log for that order.
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