diff --git a/.github/actions/scripts/send_chat_message.sh b/.github/actions/scripts/send_chat_message.sh
new file mode 100644
index 000000000000..78ebba5f20af
--- /dev/null
+++ b/.github/actions/scripts/send_chat_message.sh
@@ -0,0 +1,70 @@
+#!/usr/bin/env -S bash -euo pipefail
+
+#
+# Copyright (c) 2024 DuckDuckGo
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+if [ -z "${MM_AUTH_TOKEN:-}" ]; then
+  echo 'MM_AUTH_TOKEN is not set!'
+  exit 1
+fi
+
+if [ -z "${MM_TEAM_ID:-}" ]; then
+  echo 'MM_TEAM_ID is not set!'
+  exit 1
+fi
+
+message="${1:-test}"
+channel_name="david-test-channel"
+username="dax"
+priority="empty" # empty, important, or urgent
+request_ack="false"
+# Same icon as https://dub.duckduckgo.com/orgs/duckduckgo/teams/ci/edit. Uploaded with `s3cmd put --acl-public dax-ci-avatar.png 's3://ddg-chef/dax-ci-avatar.png`
+icon_url='https://ddg-chef.s3.amazonaws.com/dax-ci-avatar.png'
+
+# API docs at https://api.mattermost.com/#tag/posts/operation/CreatePost
+MM_API='https://chat.duckduckgo.com/api/v4'
+MM_AUTH="Authorization: Bearer ${MM_AUTH_TOKEN}"
+
+echo "> Getting id of https://chat.duckduckgo.com/ddg/channels/${channel_name}..."
+channel_id=$(curl -sS -H "$MM_AUTH" "${MM_API}/teams/${MM_TEAM_ID}/channels/name/${channel_name}" | jq -r '.id')
+echo "> Found https://chat.duckduckgo.com/ddg/channels/${channel_id}"
+
+if [ "${GITHUB_ACTIONS:-}" ]; then
+  now=$(date '+%H:%M %Z')
+  single_line_message=$(echo -n "${message}" | sed -z 's_\n_%0A_g')
+  echo "::notice title=${username} to ~${channel_name} at ${now}::${single_line_message}"
+fi
+
+json_message=$(echo -n "${message}" | jq -Rs .) # includes double-quotes around message
+echo "> Sending ${json_message} with priority '${priority}'..."
+res=$(curl -sS --fail -H "$MM_AUTH" -X POST "${MM_API}/posts" -d '{
+  "channel_id":"'"${channel_id}"'",
+  "message":'"${json_message}"',
+  "metadata": {
+    "priority": {
+      "priority": "'"${priority}"'",
+      "requested_ack": '"${request_ack}"'
+    }
+  },
+  "props":{
+    "override_username": "'"${username}"'",
+    "override_icon_url":"'"${icon_url}"'",
+    "from_webhook": "true"
+  }
+}')
+
+post_id=$(echo "$res" | jq -r '.id')
+echo "✔ Sent https://chat.duckduckgo.com/ddg/pl/${post_id}"
\ No newline at end of file
diff --git a/.github/workflows/release_report_error.yml b/.github/workflows/release_report_error.yml
index 75dde4ba14d3..c7947dbc2591 100644
--- a/.github/workflows/release_report_error.yml
+++ b/.github/workflows/release_report_error.yml
@@ -4,24 +4,50 @@ on:
   workflow_dispatch:
 
 env:
-  ASANA_PAT: ${{ secrets.GH_ASANA_SECRET }}
-
-concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: true
+  MM_AUTH_TOKEN: ${{ secrets.MM_AUTH_TOKEN }}
+  MM_TEAM_ID: ${{ secrets.MM_TEAM_ID }}
+  APP_VERSION: "5.220.0"
+  emoji_start: ":flight_departure:" # 🛫 or ':soon:' 🔜
+  emoji_info: ":information_source:" # ℹ️
 
 jobs:
   report-release-error:
-    name: Create Asana Task
-    runs-on: ubuntu-20.04
+    name: Notify Mattermost
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        shell: bash
+        working-directory: ./.github/actions/scripts
 
     steps:
-      - name: Create Asana task when workflow failed
-        uses: honeycombio/gha-create-asana-task@main
+      - name: Checkout repository
+        uses: actions/checkout@v4
         with:
-          asana-secret: ${{ secrets.GH_ASANA_SECRET }}
-          asana-workspace-id: ${{ secrets.GH_ASANA_WORKSPACE_ID }}
-          asana-project-id: ${{ secrets.GH_ASANA_AOR_PROJECT_ID }}
-          asana-section-id: ${{ secrets.GH_ASANA_INCOMING_ID }}
-          asana-task-name: GH Workflow Failure - Production Release
-          asana-task-description: The end to end workflow has failed. See https://github.com/duckduckgo/Android/actions/runs/${{ github.run_id }}
\ No newline at end of file
+          submodules: recursive
+          token: ${{ secrets.GT_DAXMOBILE }}
+          fetch-depth: 0
+          ref: feature/david/11-14-gha_notify_mattermost
+
+      - name: Make sure script can be executed
+        run: |
+          chmod +x send_chat_message.sh          
+
+      - name: Send Release started message
+        run: |        
+          ./send_chat_message.sh '${{env.emoji_start}}'" Android Release ${{ env.APP_VERSION }} started by @${{ github.actor }}. https://github.com/duckduckgo/Android/actions/runs/${{ github.run_id }}"
+
+      - name: Send Release task created message
+        run: |
+          ./send_chat_message.sh '${{env.emoji_info}}'" Release task created https://github.com/duckduckgo/Android/actions/runs/${{ github.run_id }}"
+
+      - name: Send Release tag created
+        run: |
+          ./send_chat_message.sh '${{env.emoji_info}}'" Release task created https://github.com/duckduckgo/Android/actions/runs/${{ github.run_id }}"
+
+      - name: Send Release task created message
+        run: |
+          echo -n '::notice title=Inputs::' && echo '${{ toJson(inputs) }}' | sed -z 's_\n_%0A_g'; echo
+          message="Release ${{ env.APP_VERSION }} task created"
+          message+="See https://github.com/duckduckgo/Android/actions/runs/${{ github.run_id }}"          
+          ./send_chat_message.sh '${{env.emoji_info}}'" ${message}"
+          ./send_chat_message.sh '${{env.emoji_info}}'" Release task created https://github.com/duckduckgo/Android/actions/runs/${{ github.run_id }}"
\ No newline at end of file
diff --git a/.github/workflows/release_report_error_old.yml b/.github/workflows/release_report_error_old.yml
new file mode 100644
index 000000000000..75dde4ba14d3
--- /dev/null
+++ b/.github/workflows/release_report_error_old.yml
@@ -0,0 +1,27 @@
+name: Report Workflow Failed
+
+on:
+  workflow_dispatch:
+
+env:
+  ASANA_PAT: ${{ secrets.GH_ASANA_SECRET }}
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  report-release-error:
+    name: Create Asana Task
+    runs-on: ubuntu-20.04
+
+    steps:
+      - name: Create Asana task when workflow failed
+        uses: honeycombio/gha-create-asana-task@main
+        with:
+          asana-secret: ${{ secrets.GH_ASANA_SECRET }}
+          asana-workspace-id: ${{ secrets.GH_ASANA_WORKSPACE_ID }}
+          asana-project-id: ${{ secrets.GH_ASANA_AOR_PROJECT_ID }}
+          asana-section-id: ${{ secrets.GH_ASANA_INCOMING_ID }}
+          asana-task-name: GH Workflow Failure - Production Release
+          asana-task-description: The end to end workflow has failed. See https://github.com/duckduckgo/Android/actions/runs/${{ github.run_id }}
\ No newline at end of file