Publish a CMP item from an item bucket
Sitecore Content Marketing Platform (CMP) items are stored in item buckets. Item buckets let you manage large numbers of items in the content tree. An item bucket is a container that you can use to hide innumerable items and still easily retrieve and work with these items.

You can only find bucket items using the Sitecore search engine.
To find a CMP item:
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Navigate to /sitecore/content/CMP.
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On the Search tab, enter a search term and click Search.
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On the Configure ribbon, click Clone and locate the clone under the site root item:
ImportantIt is important that you clone the item because a clone is an item that inherits the field values from the original item and is not just a copy. If you copy or duplicate the item instead, the item is not synced.
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Now you can check the workflow and publish the item. Check whether the item is available on the website.