Issue: You will run into the below issue when you are try to push update 2.1 on CRM 2016 Outlook client
Error| Install exception.System.Exception: Action Microsoft.Crm.UpdateWrapper.InstallTelemetryServiceForCrmClient failed. ---> Microsoft.Crm.CrmException: Unable to Query service status.
Cause: This is known issue with the 2.1 update
Resolution: Install the 8.2.2 update from here https://www.microsoft.com/en-us/download/details.aspx?id=56131