While creating the instance, under the “Identity and API access” you may have set “Allow default access” for ‘Access scopes’, which by default disable the BigQuery from accessing your VM [1].
You cannot set access scope while your instance is running. However, you can stop your instance and edit your scopes [2].
Also if you didn’t want stop your instance, you can always take the snapshot [3] of the running instance and create a new instance with this snapshot with ‘BiqQuery’ access enabled
[1] https://cloud.google.com/compute/docs/access/service-accounts#compute_engine_default_service_account
[3] https://cloud.google.com/compute/docs/disks/create-snapshots#create_your_snapshot