diff --git a/apps/api/v2/package.json b/apps/api/v2/package.json
index 95c96ba7bc..800efd0ecb 100644
--- a/apps/api/v2/package.json
+++ b/apps/api/v2/package.json
@@ -38,7 +38,7 @@
     "@axiomhq/winston": "^1.2.0",
     "@calcom/platform-constants": "*",
     "@calcom/platform-enums": "*",
-    "@calcom/platform-libraries": "npm:@calcom/platform-libraries@0.0.347",
+    "@calcom/platform-libraries": "npm:@calcom/platform-libraries@0.0.349",
     "@calcom/platform-types": "*",
     "@calcom/platform-utils": "*",
     "@calcom/prisma": "*",
diff --git a/packages/app-store/office365calendar/lib/CalendarService.ts b/packages/app-store/office365calendar/lib/CalendarService.ts
index 84c35b3773..62219f8769 100644
--- a/packages/app-store/office365calendar/lib/CalendarService.ts
+++ b/packages/app-store/office365calendar/lib/CalendarService.ts
@@ -691,10 +691,13 @@ export default class Office365CalendarService implements Calendar {
       const response = await this.fetcher(`${await this.getUserEndpoint()}/mailboxSettings/timeZone`);
       const timezone = await handleErrorsJson<string>(response);
 
-      if (!timezone) {
-        this.log.warn("No timezone found in mailbox settings, defaulting to Europe/London");
+      if (!timezone || typeof timezone !== "string") {
+        this.log.warn("No timezone found in outlook mailbox settings, defaulting to Europe/London", {
+          timezone,
+        });
         return "Europe/London";
       }
+      this.log.info("timezone found in outlook mailbox settings", { timezone });
 
       return timezone;
     } catch (error) {
diff --git a/yarn.lock b/yarn.lock
index a3e3009751..75ad0a6ec5 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2708,7 +2708,7 @@ __metadata:
     "@axiomhq/winston": ^1.2.0
     "@calcom/platform-constants": "*"
     "@calcom/platform-enums": "*"
-    "@calcom/platform-libraries": "npm:@calcom/platform-libraries@0.0.347"
+    "@calcom/platform-libraries": "npm:@calcom/platform-libraries@0.0.349"
     "@calcom/platform-types": "*"
     "@calcom/platform-utils": "*"
     "@calcom/prisma": "*"
@@ -3767,13 +3767,13 @@ __metadata:
   languageName: unknown
   linkType: soft
 
-"@calcom/platform-libraries@npm:@calcom/platform-libraries@0.0.347":
-  version: 0.0.347
-  resolution: "@calcom/platform-libraries@npm:0.0.347"
+"@calcom/platform-libraries@npm:@calcom/platform-libraries@0.0.349":
+  version: 0.0.349
+  resolution: "@calcom/platform-libraries@npm:0.0.349"
   dependencies:
     "@calcom/features": "*"
     "@calcom/lib": "*"
-  checksum: 427ac769aeede1d75730bcef6fe63333a78f704d5549dd4ed021ca7dbfb8a2648ec5487c200097c1791a41bfb96ce11948545c1e3b0f17cdf2364e2e1afff2e3
+  checksum: 635b178c41cf39d989b7f0e8c584ee20cdcaa19a32baa2a1d388d6f124138ece0ba8d6c4c3facf71bb5f273f48d85c61c762f2beadbc9435b914ce4470e62f4c
   languageName: node
   linkType: hard