diff --git a/sceptre/synapseprod/templates/SynapseCMK-template.json b/sceptre/synapseprod/templates/SynapseCMK-template.json
index fc156d130..60e93b6b4 100644
--- a/sceptre/synapseprod/templates/SynapseCMK-template.json
+++ b/sceptre/synapseprod/templates/SynapseCMK-template.json
@@ -225,6 +225,11 @@
                                     ],
                                     "Resource": "*"
                                 },
+                                {
+                                    "Effect": "Allow",
+                                    "Action": [ "aoss:*" ],
+                                    "Resource": "*"
+                                },
                                 {
                                     "Effect": "Allow",
                                     "Action": [