diff --git a/app/overlay-dev-sectag.conf b/app/overlay-dev-sectag.conf
new file mode 100644
index 00000000..42de835f
--- /dev/null
+++ b/app/overlay-dev-sectag.conf
@@ -0,0 +1,10 @@
+#
+# Copyright (c) 2024 Nordic Semiconductor ASA
+#
+# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+#
+
+# Set nRF Cloud CoAP security tag to a dev tag to enable decoded DTLS traces.
+# It is required that the nRF Cloud CoAP server certificate has been provisioned to the sec tag.
+CONFIG_NRF_CLOUD_COAP_SEC_TAG=2147483667
+CONFIG_NRF_CLOUD_COAP_JWT_SEC_TAG=4242
diff --git a/app/sample.yaml b/app/sample.yaml
index 4bdeb726..caebee6e 100644
--- a/app/sample.yaml
+++ b/app/sample.yaml
@@ -20,6 +20,18 @@ tests:
       - CONFIG_MEMFAULT_NCS_PROJECT_KEY="PROJECTKEY"
     extra_args: EXTRA_CONF_FILE="overlay-memfault.conf;overlay-modemtrace-to-memfault.conf;overlay-etb.conf"
     tags: ci_build
+  app.build.memfault.modemtrace.uart:
+    build_only: true
+    sysbuild: true
+    integration_platforms:
+      - thingy91x/nrf9151/ns
+    platform_allow:
+      - thingy91x/nrf9151/ns
+    extra_configs:
+      - CONFIG_MEMFAULT_NCS_PROJECT_KEY="PROJECTKEY"
+    extra_args: EXTRA_CONF_FILE="overlay-memfault.conf;overlay-dev-sectag.conf"
+                app_SNIPPET=nrf91-modem-trace-uart
+    tags: ci_build
   app.build.bootloader_update:
     build_only: true
     sysbuild: true