diff --git a/CHANGELOG.md b/CHANGELOG.md
index 29071c11b48..aa6c8584489 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@ Docs: https://docs.openclaw.ai
 
 ### Fixes
 
+- Signal/Outbound: preserve case for Base64 group IDs during outbound target normalization so cross-context routing and policy checks no longer break when group IDs include uppercase characters. (#5578) Thanks @heyhudson.
 - Providers/Copilot: add `claude-sonnet-4.6` and `claude-sonnet-4.5` to the default GitHub Copilot model catalog and add coverage for model-list/definition helpers. (#20270, fixes #20091) Thanks @Clawborn.
 - Dependencies/Agents: bump embedded Pi SDK packages (`@mariozechner/pi-agent-core`, `@mariozechner/pi-ai`, `@mariozechner/pi-coding-agent`, `@mariozechner/pi-tui`) to `0.54.0`. (#21578) Thanks @Takhoffman.
 - Gateway/Config: allow `gateway.customBindHost` in strict config validation when `gateway.bind="custom"` so valid custom bind-host configurations no longer fail startup. (#20318, fixes #20289) Thanks @MisterGuy420.
diff --git a/src/channels/plugins/plugins-channel.test.ts b/src/channels/plugins/plugins-channel.test.ts
index d3f72f290fc..7c4c6ebf1fc 100644
--- a/src/channels/plugins/plugins-channel.test.ts
+++ b/src/channels/plugins/plugins-channel.test.ts
@@ -37,6 +37,12 @@ describe("signal target normalization", () => {
     ).toBe("group:VWATOdKF2hc8zdOS76q9tb0+5BI522e03QLDAq/9yPg=");
   });
 
+  it("preserves case for base64-like group IDs without signal prefix", () => {
+    expect(
+      normalizeSignalMessagingTarget("group:AbCdEfGhIjKlMnOpQrStUvWxYz0123456789+/ABCD="),
+    ).toBe("group:AbCdEfGhIjKlMnOpQrStUvWxYz0123456789+/ABCD=");
+  });
+
   it("accepts uuid prefixes for target detection", () => {
     expect(looksLikeSignalTargetId("uuid:123e4567-e89b-12d3-a456-426614174000")).toBe(true);
     expect(looksLikeSignalTargetId("signal:uuid:123e4567-e89b-12d3-a456-426614174000")).toBe(true);
diff --git a/src/infra/outbound/outbound-policy.ts b/src/infra/outbound/outbound-policy.ts
index c24ae135b24..df6ea9e16bf 100644
--- a/src/infra/outbound/outbound-policy.ts
+++ b/src/infra/outbound/outbound-policy.ts
@@ -66,7 +66,7 @@ function resolveContextGuardTarget(
 }
 
 function normalizeTarget(channel: ChannelId, raw: string): string | undefined {
-  return normalizeTargetForProvider(channel, raw) ?? raw.trim().toLowerCase();
+  return normalizeTargetForProvider(channel, raw) ?? raw.trim();
 }
 
 function isCrossContextTarget(params: {