adding region to terminate call

playbooks/edx-east/edx_provision.yml

@@ -12,6 +12,7 @@
       when: tag_lookup.instance_ids|length > 1
     - ec2:
         state: 'absent'
+        region: "{{ region }}"
         instance_ids: ${tag_lookup.instance_ids}
   roles:
     - role: launch_ec2