Calendar sync Issue

Hi,

Yesterday I created an event on my Apple Watch using Siri. After sometime I noticed that the event which I created on Apple watch is not appearing on my iPhone. I tried almost everything but nothing worked out.

I noticed that the event was created in "Calendar" Calendar and that is not even in the iPhone list of calendars.

Can someone please help me understand what I am doing wrong?

I have a default calendar set on my iPhone and I was expecting the event created using Siri on Apple Watch should fall under that default Calendar.