Apple Reminders Not Syncing with iPhone

Apple Reminders Not Syncing with iPhone

Hello- When I select to use Zoho for reminders in both Mac OS 10.12.5 and iOS 12.3.2 I am unable to get any communication. I'm using Apple Reminders on both Mac OS X and iOS. I've checked all the setting and everything looks correct. Calendar is working fine, but Reminders isn't.

Thanks!