"Your event couldn't be refreshed." message on Google calendar syncing with MacOS Calendar

MacOS = Ventura 13.2.1

Calendar = 11.0

Google = personal Google account

I have setup an account with my Google login details and the email is syncing perfect.

I am sometimes getting a ⚠️ (caution icon) with a "1" next to it.

when I click on this I get a pop-up that says,

"Your event couldn't be refreshed."

"The calendar was not found on the server."

2 options: Delete Event or OK

I've made a couple observations:

1) if I add an event on my iOS and add to the same calendar, I don't see it on my MacOS

2) If I add an event on my MacOS and add to the same calendar, it shows up on my iOS device.

What should I be looking at as the source of my issue and how can I resolve this?