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On the admin home page, select Shared Credentials.
The Shared Credentials screen is displayed.
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Select Mark as Preferred Credential
icon on a shared credential.

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Select Confirm to add your endpoint as preferred machine on the displayed pop-up box.
The shared credential is marked as preferred machine successfully.
Note: To remove shared credential as the preferred machine, you can unstar them.
How to mark as a preferred credential in Supervisor App
The preferred credential is applicable for domain user.
The preferred credential is applicable for domain user.
To mark as preferred credential:
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