Font correctly installed but not displayed in powerpoint


I am a Linux user and perphaps what I am going to ask may sound a bit stupid for all of you, but I would be very grateful if you could give me some hint:

I have correctly installed- through the Control Panel feature -  the "sternten" font available in the community download area. I can see that it has been installed in the Windows fonts folder. However, when I search for it in Powerpoint, I cannot find it.

How do I recompile or reload the fonts in Windows from shell ?

Thank you very much for your advice.

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