diff --git a/apps/SageAccountWeb/src/components/AccountSettings.tsx b/apps/SageAccountWeb/src/components/AccountSettings.tsx
index e482eb9a2b0..f757b1b6dd2 100644
--- a/apps/SageAccountWeb/src/components/AccountSettings.tsx
+++ b/apps/SageAccountWeb/src/components/AccountSettings.tsx
@@ -101,9 +101,11 @@ export const AccountSettings = () => {
     const current = new Date()
     const nextYear = new Date()
     nextYear.setFullYear(current.getFullYear() + 1)
+    const hostname = window.location.hostname.toLowerCase()
     cookies.set(SynapseConstants.DATETIME_UTC_COOKIE_KEY, isUTCTime, {
       path: '/',
       expires: nextYear,
+      domain: hostname.endsWith('.synapse.org') ? 'synapse.org' : undefined,
     })
   }, [isUTCTime])
 
diff --git a/packages/synapse-react-client/src/utils/hooks/useCookiePreferences.ts b/packages/synapse-react-client/src/utils/hooks/useCookiePreferences.ts
index 677bfdc3c08..7bfbaf11958 100644
--- a/packages/synapse-react-client/src/utils/hooks/useCookiePreferences.ts
+++ b/packages/synapse-react-client/src/utils/hooks/useCookiePreferences.ts
@@ -58,9 +58,11 @@ export const useCookiePreferences = (): [
       const current = new Date()
       const nextYear = new Date()
       nextYear.setFullYear(current.getFullYear() + 1)
+      const hostname = window.location.hostname.toLowerCase()
       cookies.set(COOKIES_AGREEMENT_COOKIE_KEY, prefs, {
         path: '/',
         expires: nextYear,
+        domain: hostname.endsWith('.synapse.org') ? 'synapse.org' : undefined,
       })
 
       setCookiePreferencesAtomValue(prefs)