I'm connected to eduroam. Can i use this to activate my Office 2016 via KMS?

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While eduroam is indeed part of the MWN network and could be sufficient to activate your Office product, the firewall settings could block a connection to the KMS server, depending on the situation. We therefore recommend establishing a VPN connection to the MWN network directly, by using programms such as AnyConnect and then activating your Office product.

You can test your connection to the KMS server with the Telnet Tool if necessary.

You can find additional information here:

Wiki RBG - AnyConnect Instructions

Wiki RBG - KMS Server unavailable