Having trouble syncing Zoho CRM with Google Contacts

Having trouble syncing Zoho CRM with Google Contacts

My company has 3 users on Zoho and none of us can get Zoho to sync correctly.

I'm using 2-way sync, and started with few Google Contacts of my own.

My CEO is using 1-way sync from Google Contacts to Zoho CRM.  He had hundreds of Google Contact entries and these contacts are not syncing properly into Zoho.  Some Google Contacts have been added as Contacts in Zoho but the data (phone, email, company, title) is not syncing completely.  Other Google Contacts are not being added to Zoho at all.

Can anyone offer advice on how to fully sync Google Contacts into Zoho so all information transfers?

Thanks,
Peter