diff --git a/packages/agents-a365-observability/src/tracing/exporter/Agent365Exporter.ts b/packages/agents-a365-observability/src/tracing/exporter/Agent365Exporter.ts
index 9862bf3e..2b49ccb3 100644
--- a/packages/agents-a365-observability/src/tracing/exporter/Agent365Exporter.ts
+++ b/packages/agents-a365-observability/src/tracing/exporter/Agent365Exporter.ts
@@ -3,7 +3,7 @@
 // Licensed under the MIT License.
 // ------------------------------------------------------------------------------
 
-import { ExportResult,ExportResultCode } from '@opentelemetry/core';
+import { ExportResult, ExportResultCode } from '@opentelemetry/core';
 import { ReadableSpan, SpanExporter } from '@opentelemetry/sdk-trace-base';
 
 import { PowerPlatformApiDiscovery, ClusterCategory } from '@microsoft/agents-a365-runtime';
@@ -65,12 +65,12 @@ interface OTLPStatus {
   message?: string;
 }
 
-
 /**
  * Observability span exporter for Agent365:
  * - Partitions spans by (tenantId, agentId)
  * - Builds OTLP-like JSON: resourceSpans -> scopeSpans -> spans
  * - POSTs per group to https://{endpoint}/maven/agent365/agents/{agentId}/traces?api-version=1
+ *   or, when useS2SEndpoint is true, https://{endpoint}/maven/agent365/service/agents/{agentId}/traces?api-version=1
  * - Adds Bearer token via token_resolver(agentId, tenantId)
  */
 export class Agent365Exporter implements SpanExporter {
@@ -147,16 +147,23 @@ export class Agent365Exporter implements SpanExporter {
 
     const usingCustomServiceEndpoint = useCustomDomainForObservability();
 
+    // Select endpoint path based on S2S flag
+    const endpointPath =
+      this.options.useS2SEndpoint
+        ? `/maven/agent365/service/agents/${agentId}/traces`
+        : `/maven/agent365/agents/${agentId}/traces`;
+
     let url: string;
     if (usingCustomServiceEndpoint) {
-      url = resolveAgent365Endpoint(this.options.clusterCategory as ClusterCategory);
+      const base = resolveAgent365Endpoint(this.options.clusterCategory as ClusterCategory);
+      url = `${base}${endpointPath}?api-version=1`;
       logger.info(`[Agent365Exporter] Using custom domain endpoint: ${url}`);
     } else {
       // Default behavior: discover PPAPI gateway endpoint per-tenant
       const discovery = new PowerPlatformApiDiscovery(this.options.clusterCategory as ClusterCategory);
       const endpoint = discovery.getTenantIslandClusterEndpoint(tenantId);
-      url = `https://${endpoint}/maven/agent365/agents/${agentId}/traces?api-version=1`;
-      logger.info(`[Agent365Exporter] Resolved endpoint: ${endpoint}`);
+      url = `https://${endpoint}${endpointPath}?api-version=1`;
+      logger.info(`[Agent365Exporter] Resolved endpoint: ${url}`);
     }
 
     const headers: Record<string, string> = {
diff --git a/packages/agents-a365-observability/src/tracing/exporter/Agent365ExporterOptions.ts b/packages/agents-a365-observability/src/tracing/exporter/Agent365ExporterOptions.ts
index 547b4e47..749fa396 100644
--- a/packages/agents-a365-observability/src/tracing/exporter/Agent365ExporterOptions.ts
+++ b/packages/agents-a365-observability/src/tracing/exporter/Agent365ExporterOptions.ts
@@ -20,6 +20,7 @@ export type TokenResolver = (agentId: string, tenantId: string) => string | null
  * @property {ClusterCategory | string} clusterCategory Environment / cluster category (e.g. "preprod", "prod", default to "prod").
  * @property {TokenResolver} [tokenResolver] Optional delegate to obtain an auth token. If omitted the exporter will
  *           fall back to reading the cached token (AgenticTokenCacheInstance.getObservabilityToken).
+ * @property {boolean} [useS2SEndpoint] When true, exporter will POST to the S2S path (/maven/agent365/service/agents/{agentId}/traces).
  * @property {number} maxQueueSize Maximum span queue size before drops occur (passed to BatchSpanProcessor).
  * @property {number} scheduledDelayMilliseconds Delay between automatic batch flush attempts.
  * @property {number} exporterTimeoutMilliseconds Per-export timeout (abort if exceeded).
@@ -32,6 +33,9 @@ export class Agent365ExporterOptions {
   /** Optional delegate to resolve auth token used by exporter */
   public tokenResolver?: TokenResolver; // Optional if ENABLE_A365_OBSERVABILITY_EXPORTER is false
 
+  /** When true, use S2S endpoint path for export. */
+  public useS2SEndpoint: boolean = false;
+
   /** Maximum span queue size before new spans are dropped. */
   public maxQueueSize: number = 2048;
 
diff --git a/tests/observability/core/agent365-exporter.test.ts b/tests/observability/core/agent365-exporter.test.ts
index 022bc65b..b9cb1e91 100644
--- a/tests/observability/core/agent365-exporter.test.ts
+++ b/tests/observability/core/agent365-exporter.test.ts
@@ -126,7 +126,7 @@ describe('Agent365Exporter', () => {
     expect(fetchCalls.length).toBe(1);
     const urlArg = fetchCalls[0][0];
     const headersArg = fetchCalls[0][1].headers;
-    expect(urlArg).toBe(expectedUrl);
+    expect(urlArg).toBe(`${expectedUrl}/maven/agent365/agents/${agentId}/traces?api-version=1`);
     expect(headersArg['x-ms-tenant-id']).toBe(tenantId);
     expect(headersArg['authorization']).toBe(`Bearer ${token}`);
   });
@@ -164,4 +164,61 @@ describe('Agent365Exporter', () => {
     // Intentionally omit tokenResolver
     expect(() => new Agent365Exporter(opts)).toThrow(/tokenResolver must be provided/);
   });
+  it('uses S2S endpoint path when useS2SEndpoint is true (discovery flow)', async () => {
+    mockFetchSequence([200]);
+    const token = 'tok-s2s';
+    const opts = new Agent365ExporterOptions();
+    opts.clusterCategory = 'prod';
+    opts.tokenResolver = () => token;
+    opts.useS2SEndpoint = true;
+
+    const exporter = new Agent365Exporter(opts);
+    const spans = [
+      makeSpan({
+        [OpenTelemetryConstants.TENANT_ID_KEY]: tenantId,
+        [OpenTelemetryConstants.GEN_AI_AGENT_ID_KEY]: agentId
+      }, 's2s-span')
+    ];
+
+    const callback = jest.fn();
+    await exporter.export(spans, callback);
+
+    expect(callback).toHaveBeenCalledWith({ code: ExportResultCode.SUCCESS });
+    const fetchCalls = (global.fetch as unknown as { mock: { calls: any[] } }).mock.calls;
+    expect(fetchCalls.length).toBe(1);
+
+    const urlArg = fetchCalls[0][0] as string;
+    expect(urlArg).toMatch(`/maven/agent365/service/agents/${agentId}/traces?api-version=1`);
+    const headersArg = fetchCalls[0][1].headers as Record<string, string>;
+    expect(headersArg['authorization']).toBe(`Bearer ${token}`);
+  });
+
+  it('uses S2S endpoint path with custom domain and sets x-ms-tenant-id', async () => {
+    mockFetchSequence([200]);
+    process.env.A365_OBSERVABILITY_USE_CUSTOM_DOMAIN = 'true';
+    const token = 'tok-s2s-custom';
+    const opts = new Agent365ExporterOptions();
+    opts.clusterCategory = 'prod';
+    opts.tokenResolver = () => token;
+    opts.useS2SEndpoint = true;
+
+    const exporter = new Agent365Exporter(opts);
+    const spans = [
+      makeSpan({
+        [OpenTelemetryConstants.TENANT_ID_KEY]: tenantId,
+        [OpenTelemetryConstants.GEN_AI_AGENT_ID_KEY]: agentId
+      }, 's2s-custom-span')
+    ];
+
+    const callback = jest.fn();
+    await exporter.export(spans, callback);
+
+    const fetchCalls = (global.fetch as unknown as { mock: { calls: any[] } }).mock.calls;
+    expect(fetchCalls.length).toBe(1);
+    const urlArg = fetchCalls[0][0] as string;
+    expect(urlArg).toMatch(`/maven/agent365/service/agents/${agentId}/traces?api-version=1`);
+    const headersArg = fetchCalls[0][1].headers as Record<string, string>;
+    expect(headersArg['authorization']).toBe(`Bearer ${token}`);
+    expect(headersArg['x-ms-tenant-id']).toBe(tenantId);
+  })
 });