Service account used for Write to Big Query subscription

[slightlynachos]

Hello,

I am trying to create a new subscription from an existing topic that will write directly to a BQ table which I have created.

However when creating I get the following error message:

Cannot determine whether service account service-xxx has permission to write to the BigQuery table. Please check that the table exists and that permissions are configured.

This isn't a service account managed by me, so I don't know how to modify its permissions.

Is there a way to choose the service account that I want to use?

Best regards!