The KMS host needs requests from at least 5 distinct client machines before it begins activating clients. Wait for more machines to check in. The client could not contact the KMS service.

Sarah was the fifth.

: Relies on KMS or Active Directory-Based Activation (ADBA) .

: A KMS host only starts activating clients once a "threshold" is met. For Microsoft 365/Office, you typically need at least five computers running the software to trigger the activation service. Periodic Renewal

You must have a KMS Host Key available in the Microsoft 365 Admin Center (formerly Volume Licensing Service Center).

While KMS is primarily used for Windows operating systems, it also supports activating volume-licensed editions of Microsoft Office, such as Office 2016, 2019, and 2021. 1. How KMS Activation Works KMS uses a client-server model.

An administrator configures a local server as the KMS host using a Customer Specific Volume License Key (CSVLK).

A "KMS Host" is set up on a server inside the network. KMS client computers (e.g., workstations running Office Volume Edition) connect to this host locally to activate.

From the Microsoft Download Center, download and run the appropriate Office Volume License Pack executable for your version of Office. Running this executable installs the package on the KMS host computer and opens the Volume Activation Tools wizard. For versions of Office prior to 2016, the process requires the Office KMS Host License Pack.

Instead of KMS, Microsoft 365 Apps use in one of two ways:

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