diff --git a/.changeset/pr-425-1576203123.md b/.changeset/pr-425-1576203123.md
new file mode 100644
index 000000000..37e94a8fe
--- /dev/null
+++ b/.changeset/pr-425-1576203123.md
@@ -0,0 +1,5 @@
+
+---
+"fusion-project-portal": patch
+--- 
+fusionLegacyEnvIdentifier should always be returned in capital letters , some application check this and are case sensitive
diff --git a/client/packages/portal-client/src/portal.config.json b/client/packages/portal-client/src/portal.config.json
index 2600eef1e..e64bcb8d2 100644
--- a/client/packages/portal-client/src/portal.config.json
+++ b/client/packages/portal-client/src/portal.config.json
@@ -40,5 +40,5 @@
 			"level": 0
 		}
 	},
-	"fusionLegacyEnvIdentifier": "ci"
+	"fusionLegacyEnvIdentifier": "CI"
 }
\ No newline at end of file
diff --git a/client/packages/portal-core/src/app/utils/app-get-legacy-client-config.ts b/client/packages/portal-core/src/app/utils/app-get-legacy-client-config.ts
index e744666ce..6169eba90 100644
--- a/client/packages/portal-core/src/app/utils/app-get-legacy-client-config.ts
+++ b/client/packages/portal-core/src/app/utils/app-get-legacy-client-config.ts
@@ -6,7 +6,7 @@ export const getLegacyClientConfig = (): Client => ({
 });
 
 export const getFusionLegacyEnvIdentifier = (): string => {
-	return window._config_.fusionLegacyEnvIdentifier;
+	return window._config_.fusionLegacyEnvIdentifier.toUpperCase();
 };
 declare global {
 	interface Window {