Samba4 AD Time Sync

I know this question is asked a lot, and I've googled for days, but none of the solutions I have found so far work. My problem is this:

Windows 10 workstations are not syncing their time with my Samba4 domain controller.

I have verified that ntpd is running. I have ntpd and domain policy configured as per this article: https://wiki.samba.org/index.php/Time_Synchronisation

When I run "net time /domain /set /Y" as administrator, the time synchronizes correctly, however automatic syncs don't work.

"w32tm /resync" returns: "https://wiki.samba.org/index.php/Time_Synchronisation"

w32tm /query /status returns:

Leap Indicator: 3(last minute has 61 seconds)
Stratum: 0 (unspecified)
Precision: -23 (119.209ns per tick)
Root Delay: 0.0000000s
Root Dispersion: 0.0000000s
ReferenceId: 0x00000000 (unspecified)
Last Successful Sync Time: unspecified
Source: Local CMOS Clock
Poll Interval: 6 (64s)

w32tm /query /configuration returns:

[Configuration]

EventLogFlags: 2 (Policy)
AnnounceFlags: 10 (Policy)
TimeJumpAuditOffset: 28800 (Local)
MinPollInterval: 6 (Policy)
MaxPollInterval: 10 (Policy)
MaxNegPhaseCorrection: 172800 (Policy)
MaxPosPhaseCorrection: 172800 (Policy)
MaxAllowedPhaseOffset: 300 (Policy)

FrequencyCorrectRate: 4 (Policy)
PollAdjustFactor: 5 (Policy)
LargePhaseOffset: 50000000 (Policy)
SpikeWatchPeriod: 900 (Policy)
LocalClockDispersion: 10 (Policy)
HoldPeriod: 5 (Policy)
PhaseCorrectRate: 1 (Policy)
UpdateInterval: 100 (Policy)

FileLogName: c:\temp\time_debug.log (Local)
FileLogEntries: 0-300 (Local)
FileLogSize: 100000 (Local)

[TimeProviders]

NtpClient (Local)
DllName: C:\WINDOWS\SYSTEM32\w32time.DLL (Local)
Enabled: 1 (Local)
InputProvider: 1 (Local)
CrossSiteSyncFlags: 2 (Policy)
AllowNonstandardModeCombinations: 1 (Local)
ResolvePeerBackoffMinutes: 15 (Policy)
ResolvePeerBackoffMaxTimes: 7 (Policy)
CompatibilityFlags: 2147483648 (Local)
EventLogFlags: 0 (Policy)
LargeSampleSkew: 3 (Local)
SpecialPollInterval: 3600 (Policy)
Type: NT5DS (Policy)

I am at a loss as to where to look.