I was informed that I could set up a two-way sync between my MacBook Pro’s calendar and contacts and my Zoho Mail calendar and contacts. However, it's not working as expected.

When I add an event to the Mac Calendar, it does not appear in the Zoho Mail calendar on my Mac. However, it does sync to my iPhone’s default calendar, but not to the Zoho Mail calendar on my iPhone.

Are there any step-by-step instructions to ensure that calendar events and contacts entered on my MacBook or iPhone sync properly with Zoho Mail’s calendar and contacts on both devices?