In the Matillion ETL tool, I am unable to get a GCP project in the dropdown, while configuring the User Credentials

I have a service account which has access to google cloud resources. I want to configure this service account as a user account in Matillion. When I create a new User account in GCP, it does not display the name of the GCP project in the dropdown. Instead it always points another project. Does this have to do with the fact that testing projects in GCP cannot be accessed by Matillion.

I think I could have tried more before asking the question. The option of environment lies below the encryption which has 2 values KMS and encoded. GCP projects are of two types, TESTING and PRODUCTION. TESTING projects do not have access to KMS (probably , need to find out). If we choose encoded, everything works like a charm.