I have added Service Account Details and my own email:
XXX@ProjectNameYYY.iam.gserviceaccount.com
As I understand email can have secured access to the Specific Google Sheet.
It is a Google Cloud IAM service account, likely used for integrating an external service (“servicehoster”) with GCP resources. It operates as a non-human identity, commonly requiring specific IAM roles for API access, service agent, or infrastructure tasks.
How to connect specific Google Sheet URL and this IAM ID as project was generated and Service Account Details were set.