Windows Server 2016中BPA扫描执行失败，执行策略被覆盖求助

环境信息 #

• 操作系统：Windows Server 2016 -- 版本1607（OS内部版本14393.6452）
• PowerShell版本：5.1.14393.6343

问题现象 #

执行BPA扫描时，无论通过**服务器管理器（Server Manager）**还是PowerShell执行get-bpamodel命令，均返回以下错误：

get-bpamodel : There has been an error while trying to set the process wide execution policy. (Inner Exception:
Windows PowerShell updated your execution policy successfully, but the setting is overridden by a policy defined at a
more specific scope.  Due to the override, your shell will retain its current effective execution policy of
Unrestricted. Type "Get-ExecutionPolicy -List" to view your execution policy settings. For more information please see
"Get-Help Set-ExecutionPolicy".)
At line:1 char:1
+ get-bpamodel
+ ~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Get-BpaModel], CommandLetException
    + FullyQualifiedErrorId : SetExecutionPolicyError,Microsoft.BestPractices.Cmdlets.GetModelCommand

额外现象：在PowerShell中执行get-bpamodel后，Process范围的执行策略会被修改为RemoteSigned（如下），关闭窗口重新打开提升权限的PowerShell后，执行策略恢复原有设置：

Scope ExecutionPolicy
        ----- ---------------
MachinePolicy    Unrestricted
   UserPolicy    Unrestricted
      Process    RemoteSigned
  CurrentUser          Bypass
 LocalMachine          Bypass

已排查/尝试的操作 #

• 将服务器从影响PowerShell脚本执行的企业组策略（GPO）中移除，通过RSOP.msc确认相关策略已设为“未配置”并重启服务器
• 手动将所有执行策略设置为Bypass，设置后的执行策略列表如下：

Scope ExecutionPolicy
        ----- ---------------
MachinePolicy    Unrestricted
   UserPolicy    Unrestricted
      Process          Bypass
  CurrentUser          Bypass
 LocalMachine          Bypass

• 使用本地管理员而非域管理员执行操作，问题依旧
• 将GPO策略设置为允许所有脚本运行（Unrestricted），问题未解决
• 通过以下命令执行单独脚本，错误仍存在：

powershell.exe -executionpolicy bypass C:\Users\Public\bpagit.ps1

求助需求 #

目前不确定遗漏了哪些配置，恳请提供解决建议！

内容的提问来源于stack exchange，提问作者BraveITMan