Problem to use ntp server and client in rb3011

Hello everyone. I have a RB3011UiAS and the NTP server and client service is giving me problems.
I have this configuration /system ntp client
set enabled=yes primary-ntp=216.239.35.12 secondary-ntp=23.131.160.7
/system ntp server
set enabled=yes multicast=yes
But it’s not working, can you help me, please.
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