UNC Hardening in Windows 10 and Windows Server 2016 are preventing access to Domain Controllers via a UNC path which is composed of an IP Address.
Password Manager access SYSVOL via a UNC path which is composed of an IP Address by default.
This issue is documented under this Microsoft resource:
This issue is noted as a product defect and is being tracked as Defect ID TF00746475
Follow the instructions noted under the section titled Configuring UNC Hardened Access through Group Policy
Waiting for fix in a future release of Password Manager.