Hi Miatka,
We could not find EncryptAppData parameter under Get/Set-CsMobilityPolicy, however we find it from the following link:
https://msdn.microsoft.com/en-us/skype/ucwa/policies_ref
So this is an issue about Skype for business development, you could post this case to Skype for business development forum by the following link, thanks for your understanding and support.
https://social.msdn.microsoft.com/Forums/en-US/home?category=SfB
Best Regards,
Jim Xu
TechNet Community Support
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