The current crop of atomic clocks are inexpensive and largely disposable. But
the following might be of interest.

If the clock refuses to sync, check to see if the ferrite antenna is loose and
rattling. I've found that if it isn't sitting "vertical", it doesn't pick up
enough signal.

These clocks generally sync around midnight. But whoever wrote the firmware
didn't think to attempt a sync when the batteries were installed. So if you
don't want to wait forever, manually set the clock to 11:55 PM (or
thereabouts). You should have sync within a few minutes.