Create an SFMC tenant
The tenant is a container for the settings you must configure for the service.
To create a Salesforce Marketing Cloud (SFMC) tenant:
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On the Sitecore Launchpad, open the Content Editor.
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Go to /sitecore/system/Data Exchange and right-click Data Exchange.
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On the Insert menu, click Connect for SFMC Tenant.

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Go to /sitecore/system/Data Exchange/
. On the Content tab, in the Administration section, click Enabled. 
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Make a note of the tenant ID. You need it to configure the connection string.
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Save the item.
If you have an XPScaled instance, you must also:
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Go to
<tenant name>/Endpoints/Providers/xConnect/xConnect Client Endpoint. -
Clear the Use Collection Service Settings For All Services check box.
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Fill in the following fields:
Section Field Value Search Service Search Service Connection String Name xconnect.search Search Service Search Service Certificate Connection String Name xconnect.search.certificate Configuration Service Configuration Service Connection String Name xconnect.collection Configuration Service Configuration Service Certificate Connection String Name xconnect.collection.certificate The settings should now look like this:

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Save the item.