Office Online Server 和 SharePoint 2016配置时报错

　1、证书错误

 

 2、

$Farm = Get-SPFarm
$Farm.Properties.Add("WopiLegacySoapSupport", "http://<URL>/x/_vti_bin/ExcelServiceInternal.asmx");
$Farm.Update()
报错： "Item has already been added".

You can update the farm properties like below:

  $Farm.Properties["WopiLegacySoapSupport"]=correct url     
  $Farm.Update()