By default, systemd-timesyncd is trying various servers *.debian.pool.ntp.org, but these all time out due to our site firewall configuration.
The local NTP server addresses are supplied by dhcp, and I can see these written to the file /run/ntp.conf.dhcp . However, since Raspbian is using systemd-timesyncd rather than ntpd, that doesn't appear to have any effect. It looks like some glue is missing.
Googling and manpage-reading found a temporary workaround - I added a file /etc/systemd/timesyncd.conf.d/site.conf containing approximately
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[Time] NTP=ntp-0.localdomain ntp-1.localdomain
Does anyone know how this should be done properly? Or have I missed something?