SYMPTOM:
"Strategy server products require activation within xxx calendar days of installation" error in Strategy Desktop 9.x, as shown below:

Sample Code/Error
Strategy's server products require activation within xxx calendar days of installation. At least one server product has not yet been activated after installation and/or upgrade. These product(s) will remain functional for another xxx days after which they will not restart. Please activate these products using License Manager or visit the activation web site at https://licensing.Strategy.com.
However, the product is already active when checking in License Manager, as shown below:

CAUSE:
A possible reason of the issue is that the Intelligence Server was not restarted properly.
ACTION:
Restart the Intelligence Server.
KB45109