We have installed CU14 in one exchange 2016 server and as per the KB
https://support.microsoft.com/en-my/help/4532190/autodiscover-event-id-1-after-installing-exchange-s...
We now have the event id 1 logged in the eventvwr .
the solution provided to use
Get-AutodiscoverVirtualDirectory -Server YourExchangeServerName |set-AutodiscoverVirtualDirectory -ExternalUrl https://autodiscover.FQDN/Autodiscover/Autodiscover.xml
does not work since the -externalurl does not exist
