diff --git a/bin/action.min.js b/bin/action.min.js
index 3530b852..d263a08e 100644
--- a/bin/action.min.js
+++ b/bin/action.min.js
@@ -93151,6 +93151,17 @@ async function postChannelSuccessComment(github, context, result, commit) {
   core.endGroup();
 }
 
+function getProjectIdByAlias(alias) {
+  try {
+    const firebaserc = JSON.parse(fs.readFileSync(".firebaserc", {
+      encoding: 'utf-8'
+    }));
+    return firebaserc.projects[alias];
+  } catch (e) {
+    return undefined;
+  }
+}
+
 /**
  * Copyright 2020 Google LLC
  *
@@ -93216,7 +93227,9 @@ async function run() {
         throw Error(deployment.error);
       }
       core.endGroup();
-      const hostname = target ? `${target}.web.app` : `${projectId}.web.app`;
+      // ProjectId may be an alias. Try to get the real project id from .firebaserc
+      const parsedProjectId = getProjectIdByAlias(projectId) || projectId;
+      const hostname = target ? `${target}.web.app` : `${parsedProjectId}.web.app`;
       const url = `https://${hostname}/`;
       await finish({
         details_url: url,
@@ -93226,6 +93239,9 @@ async function run() {
           summary: `[${hostname}](${url})`
         }
       });
+      core.setOutput("urls", [url]);
+      core.setOutput("expire_time", undefined);
+      core.setOutput("details_url", url);
       return;
     }
     const channelId = getChannelId(configuredChannelId, github.context);
diff --git a/src/getProjectIdByAlias.ts b/src/getProjectIdByAlias.ts
new file mode 100644
index 00000000..7878248c
--- /dev/null
+++ b/src/getProjectIdByAlias.ts
@@ -0,0 +1,10 @@
+import { readFileSync } from "fs";
+
+export function getProjectIdByAlias(alias: string): string {
+    try {
+        const firebaserc = JSON.parse(readFileSync(".firebaserc", { encoding: 'utf-8' }));
+        return firebaserc.projects[alias];
+    } catch (e) {
+        return undefined;
+    }
+}
diff --git a/src/index.ts b/src/index.ts
index ef90f2db..749f5ff7 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -36,6 +36,7 @@ import {
   getURLsMarkdownFromChannelDeployResult,
   postChannelSuccessComment,
 } from "./postOrUpdateComment";
+import { getProjectIdByAlias } from "./getProjectIdByAlias";
 
 // Inputs defined in action.yml
 const expires = getInput("expires");
@@ -99,8 +100,13 @@ async function run() {
       }
       endGroup();
 
-      const hostname = target ? `${target}.web.app` : `${projectId}.web.app`;
+      // ProjectId may be an alias. Try to get the real project id from .firebaserc
+      const parsedProjectId = getProjectIdByAlias(projectId) || projectId;
+      const hostname = target
+        ? `${target}.web.app`
+        : `${parsedProjectId}.web.app`;
       const url = `https://${hostname}/`;
+
       await finish({
         details_url: url,
         conclusion: "success",
@@ -109,6 +115,11 @@ async function run() {
           summary: `[${hostname}](${url})`,
         },
       });
+
+      setOutput("urls", [url]);
+      setOutput("expire_time", undefined);
+      setOutput("details_url", url);
+
       return;
     }