diff --git a/serverless/functions/minglaradmin.yml b/serverless/functions/minglaradmin.yml
index 41406e7..5c2593a 100644
--- a/serverless/functions/minglaradmin.yml
+++ b/serverless/functions/minglaradmin.yml
@@ -327,6 +327,22 @@ RejectPQQByAM:
         path: /minglaradmin/hosthub/hosts/reject-pq-by-am
         method: patch
 
+rejectActivityDetailsApplicationByAM:
+  handler: src/modules/minglaradmin/handlers/hosthub/hosts/rejectActivityApplicationByAM.handler
+  memorySize: 384
+  package:
+    patterns:
+      - 'src/modules/minglaradmin/handlers/hosthub/hosts/rejectActivityApplicationByAM**'
+      - 'src/modules/minglaradmin/services/**'
+      - ${file(./serverless/patterns/base.yml):pattern1}
+      - ${file(./serverless/patterns/base.yml):pattern2}
+      - ${file(./serverless/patterns/base.yml):pattern3}
+      - ${file(./serverless/patterns/base.yml):pattern4}
+  events:
+    - httpApi:
+        path: /minglaradmin/hosthub/hosts/reject-activity-application-by-am
+        method: patch
+
 acceptPQByAM:
   handler: src/modules/minglaradmin/handlers/hosthub/hosts/acceptPQByAM.handler
   memorySize: 384
diff --git a/src/modules/minglaradmin/handlers/hosthub/hosts/acceptActivityApplicationByAM.ts b/src/modules/minglaradmin/handlers/hosthub/hosts/acceptActivityApplicationByAM.ts
index 93dd345..99e7fd1 100644
--- a/src/modules/minglaradmin/handlers/hosthub/hosts/acceptActivityApplicationByAM.ts
+++ b/src/modules/minglaradmin/handlers/hosthub/hosts/acceptActivityApplicationByAM.ts
@@ -1,10 +1,10 @@
-import { verifyMinglarAdminToken } from '../../../../../common/middlewares/jwt/authForMinglarAdmin';
-import { MinglarService } from '../../../services/minglar.service';
 import { APIGatewayProxyEvent, APIGatewayProxyResult, Context } from 'aws-lambda';
 import { prismaClient } from '../../../../../common/database/prisma.lambda.service';
+import { verifyMinglarAdminToken } from '../../../../../common/middlewares/jwt/authForMinglarAdmin';
 import { safeHandler } from '../../../../../common/utils/handlers/safeHandler';
 import ApiError from '../../../../../common/utils/helper/ApiError';
 import { sendActivityAcceptanceMailtoHost } from '../../../../minglaradmin/services/approvalMailtoHost.service';
+import { MinglarService } from '../../../services/minglar.service';
 
 const minglarService = new MinglarService(prismaClient);
 
diff --git a/src/modules/minglaradmin/handlers/hosthub/hosts/rejectActivityApplicationByAM.ts b/src/modules/minglaradmin/handlers/hosthub/hosts/rejectActivityApplicationByAM.ts
new file mode 100644
index 0000000..70ea9cd
--- /dev/null
+++ b/src/modules/minglaradmin/handlers/hosthub/hosts/rejectActivityApplicationByAM.ts
@@ -0,0 +1,59 @@
+import { APIGatewayProxyEvent, APIGatewayProxyResult, Context } from 'aws-lambda';
+import { prismaClient } from '../../../../../common/database/prisma.lambda.service';
+import { verifyMinglarAdminToken } from '../../../../../common/middlewares/jwt/authForMinglarAdmin';
+import { safeHandler } from '../../../../../common/utils/handlers/safeHandler';
+import ApiError from '../../../../../common/utils/helper/ApiError';
+import { sendActivityRejectionMailtoHost } from '../../../../minglaradmin/services/rejectionMailtoHost.service';
+import { MinglarService } from '../../../services/minglar.service';
+
+const minglarService = new MinglarService(prismaClient);
+
+interface Body {
+    activityId: number;
+}
+
+export const handler = safeHandler(async (
+    event: APIGatewayProxyEvent,
+    context?: Context
+): Promise<APIGatewayProxyResult> => {
+    const token = event.headers['x-auth-token'] || event.headers['X-Auth-Token'];
+    if (!token) throw new ApiError(401, 'This is a protected route. Please provide a valid token.');
+
+    const userInfo = await verifyMinglarAdminToken(token);
+
+    // Parse request body
+    let body: Body;
+
+    try {
+        body = event.body ? JSON.parse(event.body) : {};
+    } catch (error) {
+        throw new ApiError(400, 'Invalid JSON in request body');
+    }
+
+    const { activityId } = body;
+
+    if (!activityId) {
+        throw new ApiError(400, 'activityId is required');
+    }
+
+    await minglarService.rejectActivityApplicationByAM(
+        Number(activityId),
+        Number(userInfo.id)
+    );
+    const hostXid = await minglarService.getHostXidByActivityId(activityId)
+    const hostDetails = await minglarService.getUserDetails(hostXid)
+    await sendActivityRejectionMailtoHost(hostDetails.emailAddress, hostDetails.firstName)
+
+    return {
+        statusCode: 201,
+        headers: {
+            'Content-Type': 'application/json',
+            'Access-Control-Allow-Origin': '*',
+        },
+        body: JSON.stringify({
+            success: true,
+            message: 'Rejected activity details application successfully',
+            data: null,
+        }),
+    };
+});
diff --git a/src/modules/minglaradmin/services/minglar.service.ts b/src/modules/minglaradmin/services/minglar.service.ts
index fdfaf5d..e865e24 100644
--- a/src/modules/minglaradmin/services/minglar.service.ts
+++ b/src/modules/minglaradmin/services/minglar.service.ts
@@ -1765,6 +1765,35 @@ export class MinglarService {
       })
     })
   }
+  
+  
+  async rejectActivityApplicationByAM(activityId: number, user_xid: number) {
+    return await this.prisma.$transaction(async (tx) => {
+      await tx.activities.update({
+        where: {
+          id: activityId,
+          isActive: true
+        },
+        data: {
+          activityInternalStatus: ACTIVITY_INTERNAL_STATUS.ACTIVITY_REJECTED,
+          activityDisplayStatus: ACTIVITY_DISPLAY_STATUS.ENHANCING,
+          amInternalStatus: ACTIVITY_AM_INTERNAL_STATUS.ACTIVITY_REJECTED,
+          amDisplayStatus: ACTIVITY_AM_DISPLAY_STATUS.ENHANCING
+        }
+      })
+
+      await tx.activityTrack.create({
+        data: {
+          activityXid: activityId,
+          trackType: ACTIVITY_TRACK_TYPE.ACTIVITY,
+          trackStatus: ACTIVITY_TRACK_STATUS.REJECTED_BY_AM,
+          updatedByXid: user_xid,
+          updatedByRole: ROLE_NAME.ACCOUNT_MANAGER,
+          updatedOn: new Date()
+        }
+      })
+    })
+  }
 
   async acceptPQByAM(activityId: number, user_xid: number) {
     return await this.prisma.$transaction(async (tx) => {
diff --git a/src/modules/minglaradmin/services/rejectionMailtoHost.service.ts b/src/modules/minglaradmin/services/rejectionMailtoHost.service.ts
index 0d2f8f8..7ee7e89 100644
--- a/src/modules/minglaradmin/services/rejectionMailtoHost.service.ts
+++ b/src/modules/minglaradmin/services/rejectionMailtoHost.service.ts
@@ -127,3 +127,49 @@ export async function sendAMPQQRejectionMailtoHost(
         throw new ApiError(500, "Failed to send OTP to minglar admin via email.");
     }
 }
+
+
+export async function sendActivityRejectionMailtoHost(
+    emailAddress: string,
+    name: string
+): Promise<{
+    sent: boolean;
+    //  messageId: string
+}> {
+
+    const subject = "Improvement of your activity onboarding application";
+
+    const htmlContent = `
+    <p>Dear ${name},</p>
+
+    <p>Your account manager has reviewed your activity application and provided some suggestions.<br/>
+    Please make the necessary improvements and re-submit your activity application along with the pre-qualification answers to proceed with the onboarding process on Minglar.</p>
+
+    <p>You may access your activity onboarding application using the link below:<br/>
+    <strong>Link:</strong> ${config.HOST_LINK}</p>
+
+    <p>If you have any questions, please feel free to contact the Minglar Support Team.</p>
+
+    <p>Best regards,<br/>
+    <strong>Minglar Team</strong></p>
+
+  `;
+
+    try {
+        const result = await brevoService.sendEmail({
+            recipients: [{ email: emailAddress }],
+            subject,
+            htmlContent,
+        });
+
+        console.log("📧 Email sent successfully:", result);
+
+        return {
+            sent: true,
+            // messageId: result.messageId
+        };
+    } catch (err) {
+        console.error("Brevo email send failed:", err);
+        throw new ApiError(500, "Failed to send OTP to minglar admin via email.");
+    }
+}