Consider the following scenario in Microsoft Skype for Business 2016:
You have a user who has an assigned location profile that uses normalization rules in Microsoft Skype for Business 2016.
After signing in to the Skype for Business client, the user experiences a network disconnection.
The client performs a recovery sign-in and reconnects.
After it reconnects, the client does not normalize phone numbers by using the normalization rules that are defined in their location profile.
During a recovery sign-in, certain information persists. This causes the request for a user's location profile to be skipped.
To fix this issue, install the October 6, 2020, update (KB4486669) for Microsoft Skype for Business 2016.