I don't believe you can sync your native calendars and would instead need to make a Shared Calendar and place the events on it that you want to share with each other.
* Select the hamburger * Scroll down to Manage Calendars * Under your Samsung Account, select Create Shared Calendar * Name it, select a color, tap Create, set the permissions level, then choose your desired contact that you want to share with. * Once they accept the invite, they'll have access to view and edit if that's what you selected for the permission. The calendar will be listed under both of your Samsung Accounts where you can turn on or turn off the overlay on your native calendars. * When you want to post to that Calendar, create the event and change the calendar to your shared calendar.
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