Which calendar must not be primary Gcal?

Hi!

My Gcal I want to sync is my primary calendar, and I have created a new appointments+ calendar in Gcal, that is not primary.

Do you mean that it’s difficult to share my primary Gcal? That’s why I have problems with the dates. The problem is not delay, is that sometimes in app+cal is shown as available but is actually busy or sometimes is busy when is actually available. I don’t understand why.

What can I do?