Proper certified advice about license/activation codes -> possible to receive with direct F-Secure Support Channels (chat/phone):
Potential unofficial suggestions:
Also possible to re-check some Knowledgebase-articles:
May I know if you see any error message when trying to activate it on the third device?
What is the OS of this device?
Good to try contact direct F-Secure Support channels (chat or phone):
As startpoint for proper view: does your subscription with expected count or type for this third device.
For example, available such Knowledgebase article:
I able to suspect that except noted points -> can be many others (like troubles with network; or another security solution do block activation of Freedome as blocking connection to license-servers; and so on).
Yes, as Ukko has suggested, we need more details in order to analyze this issue. Kindly get in touch with our support team to troubleshoot further.
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