Help! Indesign Date Merge multiple records per page

I’m doing a simple Indesign data merge with multiple record layout to place 8 name tags per page (using Avery Template 5390).

I have a single design on the page (with 3 variable text fields). It won't create multiple records per page - it keeps putting one name tag on each page.

I’ve done Data Merge > Create Merged Document > Multiple Records per Page. When I select “Preview Multiple Record Layout” it populates the first name tag but shows no additional name tags. When I click “Ok” to merge, it creates one name tag per page, not the 8 name tags per page that I need to work with the Avery template. Screenshot below.
 

I’ve spent hours on this trying just about everything (including placing the design elements on a Master page). Hoping someone can help!!