diff --git a/dist/index.js b/dist/index.js
index d780839..36129f1 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -129,15 +129,18 @@ function prettyMessage(pr2user, github2provider, provider) {
  */
 function getTeamsMentions(github2provider, pr2user) {
   const mentions = [];
-  for (const user of pr2user) {
-    mentions.push({
-      type: `mention`,
-      text: `<at>${user.login}</at>`,
-      mentioned: {
-        id: github2provider[user.login],
-        name: user.login,
-      },
-    });
+  // Add mentions array only if the map is provided, or no notification is sent
+  if (Object.keys(github2provider).length > 0) {
+    for (const user of pr2user) {
+      mentions.push({
+        type: `mention`,
+        text: `<at>${user.login}</at>`,
+        mentioned: {
+          id: github2provider[user.login],
+          name: user.login,
+        },
+      });
+    }
   }
   return mentions;
 }
@@ -161,10 +164,10 @@ function formatSlackMessage(channel, message) {
  * Format the MS Teams message request object
  * Docs: https://bit.ly/3UlOoqo
  * @param {String} message formatted message string
- * @param {Array} mentionsArray teams mention objects
+ * @param {Array} [mentionsArray] teams mention objects array
  * @return {Object} Ms Teams message data object
  */
-function formatTeamsMessage(message, mentionsArray) {
+function formatTeamsMessage(message, mentionsArray = []) {
   const messageData = {
     type: `message`,
     attachments: [
@@ -10756,7 +10759,7 @@ async function main() {
     if (pullRequestsWithoutLabel.length) {
       const pr2user = createPr2UserArray(pullRequestsWithoutLabel);
       if (github2providerString && !checkGithubProviderFormat(github2providerString)) {
-        core.setFailed(`The github-provider-map string is not in correct format: "name1:id1,name2:id2,..."`);
+        return core.setFailed(`The github-provider-map string is not in correct format: "name1:id1,name2:id2,..."`);
       }
       const github2provider = stringToObject(github2providerString);
       const messageText = prettyMessage(pr2user, github2provider, provider);
diff --git a/functions.js b/functions.js
index 53cbc6f..8d09a73 100644
--- a/functions.js
+++ b/functions.js
@@ -123,15 +123,18 @@ function prettyMessage(pr2user, github2provider, provider) {
  */
 function getTeamsMentions(github2provider, pr2user) {
   const mentions = [];
-  for (const user of pr2user) {
-    mentions.push({
-      type: `mention`,
-      text: `<at>${user.login}</at>`,
-      mentioned: {
-        id: github2provider[user.login],
-        name: user.login,
-      },
-    });
+  // Add mentions array only if the map is provided, or no notification is sent
+  if (Object.keys(github2provider).length > 0) {
+    for (const user of pr2user) {
+      mentions.push({
+        type: `mention`,
+        text: `<at>${user.login}</at>`,
+        mentioned: {
+          id: github2provider[user.login],
+          name: user.login,
+        },
+      });
+    }
   }
   return mentions;
 }
@@ -155,10 +158,10 @@ function formatSlackMessage(channel, message) {
  * Format the MS Teams message request object
  * Docs: https://bit.ly/3UlOoqo
  * @param {String} message formatted message string
- * @param {Array} mentionsArray teams mention objects
+ * @param {Array} [mentionsArray] teams mention objects array
  * @return {Object} Ms Teams message data object
  */
-function formatTeamsMessage(message, mentionsArray) {
+function formatTeamsMessage(message, mentionsArray = []) {
   const messageData = {
     type: `message`,
     attachments: [
diff --git a/index.js b/index.js
index 2379df6..7421ecf 100644
--- a/index.js
+++ b/index.js
@@ -67,7 +67,7 @@ async function main() {
     if (pullRequestsWithoutLabel.length) {
       const pr2user = createPr2UserArray(pullRequestsWithoutLabel);
       if (github2providerString && !checkGithubProviderFormat(github2providerString)) {
-        core.setFailed(`The github-provider-map string is not in correct format: "name1:id1,name2:id2,..."`);
+        return core.setFailed(`The github-provider-map string is not in correct format: "name1:id1,name2:id2,..."`);
       }
       const github2provider = stringToObject(github2providerString);
       const messageText = prettyMessage(pr2user, github2provider, provider);
diff --git a/package-lock.json b/package-lock.json
index a43ea91..af81a13 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "pr-reviews-reminder-action",
-  "version": "2.4.1",
+  "version": "2.5.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "pr-reviews-reminder-action",
-      "version": "2.4.1",
+      "version": "2.5.0",
       "license": "MIT",
       "dependencies": {
         "@actions/core": "^1.10.0",
diff --git a/package.json b/package.json
index 823af79..23b2970 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "pr-reviews-reminder-action",
-  "version": "2.4.1",
+  "version": "2.5.0",
   "description": "Reminder for Pull Request pending reviews",
   "scripts": {
     "build": "ncc build index.js",
diff --git a/test/test.js b/test/test.js
index 4438b58..f8a4b67 100644
--- a/test/test.js
+++ b/test/test.js
@@ -187,6 +187,31 @@ const mockTeamsMessageRequest = {
   ],
 };
 
+const mockTeamsMessageRequestNoMentions = {
+  type: `message`,
+  attachments: [
+    {
+      contentType: `application/vnd.microsoft.card.adaptive`,
+      content: {
+        type: `AdaptiveCard`,
+        body: [
+          {
+            type: `TextBlock`,
+            text: 'Hey @User1, the PR "Title1" is waiting for your review: [https://example.com/1](https://example.com/1)',
+            wrap: true,
+          },
+        ],
+        $schema: `http://adaptivecards.io/schemas/adaptive-card.json`,
+        version: `1.0`,
+        msteams: {
+          width: 'Full',
+          entities: [],
+        },
+      },
+    },
+  ],
+};
+
 describe('Pull Request Reviews Reminder Action tests', () => {
   it('Should get pull requests with requested reviewers (some reviewers)', () => {
     const pullRequests = getPullRequestsToReview(mockPullRequests);
@@ -372,6 +397,11 @@ describe('Pull Request Reviews Reminder Action tests', () => {
     assert.deepEqual(mentions, mockTeamsMentions);
   });
 
+  it('Should create empty mentions array, Teams', () => {
+    const mentions = getTeamsMentions({}, mockPr2User);
+    assert.deepEqual(mentions, []);
+  });
+
   it('Should format a Slack message to send the request', () => {
     const channel = '#developers';
     const message = 'Hey @User1, the PR "Title1" is waiting for your review: https://example.com/1';
@@ -389,4 +419,10 @@ describe('Pull Request Reviews Reminder Action tests', () => {
     const teamsMessageRequest = formatTeamsMessage(message, mockTeamsMentions);
     assert.deepEqual(teamsMessageRequest, mockTeamsMessageRequest);
   });
+
+  it('Should format a Teams message to send the request (no mentions array)', () => {
+    const message = `Hey @User1, the PR "Title1" is waiting for your review: [https://example.com/1](https://example.com/1)`;
+    const teamsMessageRequest = formatTeamsMessage(message);
+    assert.deepEqual(teamsMessageRequest, mockTeamsMessageRequestNoMentions);
+  });
 });