Blending ga4 session data with google sheets to create conversion rate

Hi there,

I am trying to calculate a rough conversion figure/percentage for signs up using data from a Google spreadsheet.

The way I was trying to achieve this was by blending GA4 session data with the sign-up figures from the Google sheet. I managed to blend the data fine, but when trying to create a new field based on calculation (sessions divided by sign-ups) it is showing an error, and I am a little lost.

Is there a better way I can achieve this? Is there something I am doing wrong? Any help appreciated! 

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