Windows 10 became more securely, so you can’t access sysvol & netlogon shares via UNC paths – regardless if your user is Domain-Administrator or not.

To resolve this issue run gpedit.msc, go to Computer -> Administrative Templates -> Network -> Network Provider -> Hardened UNC Paths, enable the policy and  click “Show” button. Enter your server name (\\myservername) into “Value name” and enter the following text “RequireMutualAuthentication=0,RequireIntegrity=0,RequirePrivacy=0” without quotes into the “Value” field. Apply all settings and close gpedit. It works the same way on Group Policies managed via your ActiveDirectory.