diff --git a/.changeset/inventory-list-targeting-sandbox-fixture.md b/.changeset/inventory-list-targeting-sandbox-fixture.md
new file mode 100644
index 0000000000..b0b2b2d305
--- /dev/null
+++ b/.changeset/inventory-list-targeting-sandbox-fixture.md
@@ -0,0 +1,12 @@
+---
+---
+
+fix(compliance): inventory_list_targeting — add `sandbox: true` to account fixtures
+
+The 5 account blocks across this scenario use the brand+operator natural-key variant of `AccountReference` but omit the `sandbox` flag. Sellers whose `accounts.resolve` has separate code paths for sandbox vs production refs end up routing `create_media_buy` and `get_media_buys` through different account-id namespaces, which breaks `mediaBuyStore` backfill of `targeting_overlay` and fails `verify_create_persisted` / `verify_update_persisted`.
+
+Setting `sandbox: true` on every account block keeps both create and get on the sandbox path, the round-trip becomes consistent, and the storyboard exercises what it intended to: targeting persistence across the create / get / update lifecycle.
+
+Non-protocol (storyboard fixture only). No version bump.
+
+Refs: adcp-client#1487 — follow-up to fix the underlying enricher asymmetry upstream so future storyboard authors don't trip the same wire.
diff --git a/static/compliance/source/protocols/media-buy/scenarios/inventory_list_targeting.yaml b/static/compliance/source/protocols/media-buy/scenarios/inventory_list_targeting.yaml
index 93e3e32627..9502c04168 100644
--- a/static/compliance/source/protocols/media-buy/scenarios/inventory_list_targeting.yaml
+++ b/static/compliance/source/protocols/media-buy/scenarios/inventory_list_targeting.yaml
@@ -68,6 +68,7 @@ phases:
             brand:
               domain: "acmeoutdoor.example"
             operator: "pinnacle-agency.example"
+            sandbox: true
 
           context:
             correlation_id: "inventory_list_targeting--get_products_brief"
@@ -112,6 +113,7 @@ phases:
             brand:
               domain: "acmeoutdoor.example"
             operator: "pinnacle-agency.example"
+            sandbox: true
           idempotency_key: "inventory-list-targeting-create-v1"
           start_time: "2026-07-01T00:00:00Z"
           end_time: "2026-09-30T23:59:59Z"
@@ -169,6 +171,7 @@ phases:
             brand:
               domain: "acmeoutdoor.example"
             operator: "pinnacle-agency.example"
+            sandbox: true
           media_buy_ids:
             - "$context.media_buy_id"
 
@@ -212,6 +215,7 @@ phases:
             brand:
               domain: "acmeoutdoor.example"
             operator: "pinnacle-agency.example"
+            sandbox: true
           media_buy_id: "$context.media_buy_id"
           packages:
             - package_id: "$context.package_id"
@@ -248,6 +252,7 @@ phases:
             brand:
               domain: "acmeoutdoor.example"
             operator: "pinnacle-agency.example"
+            sandbox: true
           media_buy_ids:
             - "$context.media_buy_id"