What plan levels of Zendesk Sell allow access via Zapier?
Zendesk Sells's Zapier integration is only available on our Professional, Enterprise, and Elite plans. https://getbase.com/pricing/
Note: this Zapier integration can be used with a free trial.
Any other useful Info?
Some of My Records Are Missing
This is not uncommon - usually, this is a user permissions issue and you might not have permission to view the records in question. Read this Zendesk Sell help document to sort it out: https://support.getbase.com/hc/en-us/articles/203424919-How-do-I-manage-user-permissions-and-data-access-in-Zendesk-Sell-
Not All of My Contacts Triggered the Zap
Zendesk Sell sends up to 500 contacts at a time, so if more contacts are added between the zap running, they'll be missed. If you're trying to add a large number of contacts, add 500 at a time and manually run the Zap in between.