Error in Calculated field of google sheets

I have my data in the following format:

I added 2 new columns on the right:

(1) Column name: YesInCSAT, formula used: iferror(CSAT% * Total Surveys Given,"")

(2) Column name: AutomatedCount, formula used: Automation% * Tickets

Now my data looks like the image below:

I want to add a calculated field in a pivot table of google sheets that manually calculates CSAT using the formula below:

= sum(YesInCSAT)/sum(Total Surveys Given)

This works fine in Excel pivot's calculated field, but when I input this formula, I'm getting a formula parse error.

What am I missing here?