Check the daemon’s connectivity

ntpq -p

hoping to see an asterisk in the first column for one of the servers listed. If you have recently (re)started the daemon, give it a few minutes to get itself established.
Then

ntpdc -c loopinfo

to check its calculated offset. A value of 0 sec offset indicates it’s still confused.
Then

ntpdc -c kerninfo

to check the error margins don’t look too big.

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