Hello Valceen,
Thank you for posting in Microsoft Community forum.
I open server manager on client, I do not have "Run as a different user" when I right click Server Manager.
I check the same operations on Domain Controller, it only need the credential twice (one for Server Manager and one for UAC) when I right click Server manager and click "Run as a different user". Then I click other tools, it will not request credential.
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Best Regards,
Daisy Zhou