diff --git a/packages/features/ee/workflows/api/scheduleEmailReminders.ts b/packages/features/ee/workflows/api/scheduleEmailReminders.ts
index 919e98fd3f..1b3e3dacd3 100644
--- a/packages/features/ee/workflows/api/scheduleEmailReminders.ts
+++ b/packages/features/ee/workflows/api/scheduleEmailReminders.ts
@@ -191,22 +191,24 @@ async function handler(req: NextApiRequest, res: NextApiResponse) {
           cancelLink: `/booking/${reminder.booking.uid}?cancel=true`,
           rescheduleLink: `/${reminder.booking.user?.username}/${reminder.booking.eventType?.slug}?rescheduleUid=${reminder.booking.uid}`,
         };
+        const emailLocale = locale || "en";
         const emailSubject = customTemplate(
           reminder.workflowStep.emailSubject || "",
           variables,
-          locale || "",
+          emailLocale,
           !!reminder.booking.user?.hideBranding
         ).text;
         emailContent.emailSubject = emailSubject;
         emailContent.emailBody = customTemplate(
           reminder.workflowStep.reminderBody || "",
           variables,
-          locale || "",
+          emailLocale,
           !!reminder.booking.user?.hideBranding
         ).html;
 
         emailBodyEmpty =
-          customTemplate(reminder.workflowStep.reminderBody || "", variables, locale || "").text.length === 0;
+          customTemplate(reminder.workflowStep.reminderBody || "", variables, emailLocale).text.length ===
+          0;
       } else if (reminder.workflowStep.template === WorkflowTemplates.REMINDER) {
         emailContent = emailReminderTemplate(
           false,
diff --git a/packages/features/ee/workflows/api/scheduleSMSReminders.ts b/packages/features/ee/workflows/api/scheduleSMSReminders.ts
index caeec66c5a..1cca96fa19 100644
--- a/packages/features/ee/workflows/api/scheduleSMSReminders.ts
+++ b/packages/features/ee/workflows/api/scheduleSMSReminders.ts
@@ -116,7 +116,7 @@ async function handler(req: NextApiRequest, res: NextApiResponse) {
         const customMessage = customTemplate(
           reminder.workflowStep.reminderBody || "",
           variables,
-          locale || ""
+          locale || "en"
         );
         message = customMessage.text;
       } else if (reminder.workflowStep.template === WorkflowTemplates.REMINDER) {
diff --git a/packages/trpc/server/routers/viewer/workflows/activateEventType.handler.ts b/packages/trpc/server/routers/viewer/workflows/activateEventType.handler.ts
index 919527341f..bc854e889c 100644
--- a/packages/trpc/server/routers/viewer/workflows/activateEventType.handler.ts
+++ b/packages/trpc/server/routers/viewer/workflows/activateEventType.handler.ts
@@ -155,6 +155,7 @@ export const activateEventTypeHandler = async ({ ctx, input }: ActivateEventType
     });
 
     for (const booking of bookingsForReminders) {
+      const defaultLocale = "en";
       const bookingInfo = {
         uid: booking.uid,
         attendees: booking.attendees.map((attendee) => {
@@ -162,7 +163,7 @@ export const activateEventTypeHandler = async ({ ctx, input }: ActivateEventType
             name: attendee.name,
             email: attendee.email,
             timeZone: attendee.timeZone,
-            language: { locale: attendee.locale || "" },
+            language: { locale: attendee.locale || defaultLocale },
           };
         }),
         organizer: booking.user
@@ -170,13 +171,13 @@ export const activateEventTypeHandler = async ({ ctx, input }: ActivateEventType
               name: booking.user.name || "",
               email: booking.user.email,
               timeZone: booking.user.timeZone,
-              language: { locale: booking.user.locale || "" },
+              language: { locale: booking.user.locale || defaultLocale },
             }
           : { name: "", email: "", timeZone: "", language: { locale: "" } },
         startTime: booking.startTime.toISOString(),
         endTime: booking.endTime.toISOString(),
         title: booking.title,
-        language: { locale: booking?.user?.locale || "" },
+        language: { locale: booking?.user?.locale || defaultLocale },
         eventType: {
           slug: booking.eventType?.slug,
         },
diff --git a/packages/trpc/server/routers/viewer/workflows/update.handler.ts b/packages/trpc/server/routers/viewer/workflows/update.handler.ts
index ff261b5344..5643f2fbe6 100644
--- a/packages/trpc/server/routers/viewer/workflows/update.handler.ts
+++ b/packages/trpc/server/routers/viewer/workflows/update.handler.ts
@@ -257,9 +257,13 @@ export const updateHandler = async ({ ctx, input }: UpdateOptions) => {
       });
 
       steps.forEach(async (step) => {
-        if (step.action !== WorkflowActions.SMS_ATTENDEE && step.action !== WorkflowActions.WHATSAPP_ATTENDEE) {
+        if (
+          step.action !== WorkflowActions.SMS_ATTENDEE &&
+          step.action !== WorkflowActions.WHATSAPP_ATTENDEE
+        ) {
           //as we do not have attendees phone number (user is notified about that when setting this action)
           bookingsForReminders.forEach(async (booking) => {
+            const defaultLocale = "en";
             const bookingInfo = {
               uid: booking.uid,
               attendees: booking.attendees.map((attendee) => {
@@ -267,12 +271,12 @@ export const updateHandler = async ({ ctx, input }: UpdateOptions) => {
                   name: attendee.name,
                   email: attendee.email,
                   timeZone: attendee.timeZone,
-                  language: { locale: attendee.locale || "" },
+                  language: { locale: attendee.locale || defaultLocale },
                 };
               }),
               organizer: booking.user
                 ? {
-                    language: { locale: booking.user.locale || "" },
+                    language: { locale: booking.user.locale || defaultLocale },
                     name: booking.user.name || "",
                     email: booking.user.email,
                     timeZone: booking.user.timeZone,
@@ -281,7 +285,7 @@ export const updateHandler = async ({ ctx, input }: UpdateOptions) => {
               startTime: booking.startTime.toISOString(),
               endTime: booking.endTime.toISOString(),
               title: booking.title,
-              language: { locale: booking?.user?.locale || "" },
+              language: { locale: booking?.user?.locale || defaultLocale },
               eventType: {
                 slug: booking.eventType?.slug,
               },
@@ -482,6 +486,7 @@ export const updateHandler = async ({ ctx, input }: UpdateOptions) => {
           },
         });
         bookingsOfEventTypes.forEach(async (booking) => {
+          const defaultLocale = "en";
           const bookingInfo = {
             uid: booking.uid,
             attendees: booking.attendees.map((attendee) => {
@@ -489,12 +494,12 @@ export const updateHandler = async ({ ctx, input }: UpdateOptions) => {
                 name: attendee.name,
                 email: attendee.email,
                 timeZone: attendee.timeZone,
-                language: { locale: attendee.locale || "" },
+                language: { locale: attendee.locale || defaultLocale },
               };
             }),
             organizer: booking.user
               ? {
-                  language: { locale: booking.user.locale || "" },
+                  language: { locale: booking.user.locale || defaultLocale },
                   name: booking.user.name || "",
                   email: booking.user.email,
                   timeZone: booking.user.timeZone,
@@ -503,7 +508,7 @@ export const updateHandler = async ({ ctx, input }: UpdateOptions) => {
             startTime: booking.startTime.toISOString(),
             endTime: booking.endTime.toISOString(),
             title: booking.title,
-            language: { locale: booking?.user?.locale || "" },
+            language: { locale: booking?.user?.locale || defaultLocale },
             eventType: {
               slug: booking.eventType?.slug,
             },
@@ -610,7 +615,8 @@ export const updateHandler = async ({ ctx, input }: UpdateOptions) => {
         if (
           (trigger === WorkflowTriggerEvents.BEFORE_EVENT || trigger === WorkflowTriggerEvents.AFTER_EVENT) &&
           eventTypesToCreateReminders &&
-          step.action !== WorkflowActions.SMS_ATTENDEE && step.action !== WorkflowActions.WHATSAPP_ATTENDEE
+          step.action !== WorkflowActions.SMS_ATTENDEE &&
+          step.action !== WorkflowActions.WHATSAPP_ATTENDEE
         ) {
           const bookingsForReminders = await ctx.prisma.booking.findMany({
             where: {
@@ -627,6 +633,7 @@ export const updateHandler = async ({ ctx, input }: UpdateOptions) => {
             },
           });
           for (const booking of bookingsForReminders) {
+            const defaultLocale = "en";
             const bookingInfo = {
               uid: booking.uid,
               attendees: booking.attendees.map((attendee) => {
@@ -634,7 +641,7 @@ export const updateHandler = async ({ ctx, input }: UpdateOptions) => {
                   name: attendee.name,
                   email: attendee.email,
                   timeZone: attendee.timeZone,
-                  language: { locale: attendee.locale || "" },
+                  language: { locale: attendee.locale || defaultLocale },
                 };
               }),
               organizer: booking.user
@@ -642,13 +649,13 @@ export const updateHandler = async ({ ctx, input }: UpdateOptions) => {
                     name: booking.user.name || "",
                     email: booking.user.email,
                     timeZone: booking.user.timeZone,
-                    language: { locale: booking.user.locale || "" },
+                    language: { locale: booking.user.locale || defaultLocale },
                   }
                 : { name: "", email: "", timeZone: "", language: { locale: "" } },
               startTime: booking.startTime.toISOString(),
               endTime: booking.endTime.toISOString(),
               title: booking.title,
-              language: { locale: booking?.user?.locale || "" },
+              language: { locale: booking?.user?.locale || defaultLocale },
               eventType: {
                 slug: booking.eventType?.slug,
               },