diff --git a/sceptre/synapsedev/templates/SynapseCMK-template.json b/sceptre/synapsedev/templates/SynapseCMK-template.json
index 5dfd60354..4be552e60 100644
--- a/sceptre/synapsedev/templates/SynapseCMK-template.json
+++ b/sceptre/synapsedev/templates/SynapseCMK-template.json
@@ -247,6 +247,11 @@
                                     ],
                                     "Resource": "*"
                                 },
+                                {
+                                    "Effect": "Allow",
+                                    "Action": [ "aoss:*" ],
+                                    "Resource": "*"
+                                },
                                 {
                                     "Effect": "Allow",
                                     "Action": [