I saw the following error after moving the PDC role to another DC, and thus changing the Time Sync server:
NtpClient was unable to set a domain peer to use as a time source because of discovery error. NtpClient will try again in 3473457 minutes and double the reattempt interval thereafter. The error was: The entry is not found. (0x800706E1)
Additionally to changing the ‘Type’ parameter to NT5DS, you will also have to change the ‘AnnounceFlags’ back to 10 (in hex).