It could mean a lot of things depending on how you feel and what phase of your Twin Flame journey you are at.
For me, synchronization has been a form of comfort from the universe, especially during my lonely times.
I saw a lot of synchronized sequences during the Dark Night of the Soul.
For me, it is also a pat on the back from the universe to keep doing a great job on my Twin Flame Journey.
I never associated my Twin Flame with synchronized events except if I see them when I am thinking of him or feeling his energetic pull.
Sometimes the clock shows me his birthday digits when I am thinking of him.
It also depends on your emotional situation because you need encouragement now and then since the Twin Flame journey gets lonely.