Consider the following scenario:
You have deployed the Microsoft Skype for Business 2016 client.
You have Azure voicemail enabled for users.
You receive a voicemail on Azure voicemail.
In this scenario, the Skype for business client may not show the voicemail or may show the "From" part of the voicemail as "firstname.lastname@example.org" instead of the senders' name.
To fix this issue, install the April 2, 2019, update (KB4462234) for Skype for Business 2016.