diff --git a/core/server/services/auth/authorize.js b/core/server/services/auth/authorize.js
index a8fccff372..7598cac601 100644
--- a/core/server/services/auth/authorize.js
+++ b/core/server/services/auth/authorize.js
@@ -1,5 +1,11 @@
 const errors = require('@tryghost/errors');
-const i18n = require('../../../shared/i18n');
+const tpl = require('@tryghost/tpl');
+
+const messages = {
+    authorizationFailed: 'Authorization failed',
+    missingContentMemberOrIntegration: 'Unable to determine the authenticated member or integration. Check the supplied Content API Key and ensure cookies are being passed through if member auth is failing.',
+    missingAdminUserOrIntegration: 'Unable to determine the authenticated user or integration. Check that cookies are being passed through if using session authentication.'
+};
 
 const authorize = {
     authorizeContentApi(req, res, next) {
@@ -12,8 +18,8 @@ const authorize = {
             return next();
         }
         return next(new errors.NoPermissionError({
-            message: i18n.t('errors.middleware.auth.authorizationFailed'),
-            context: i18n.t('errors.middleware.auth.missingContentMemberOrIntegration')
+            message: tpl(messages.authorizationFailed),
+            context: tpl(messages.missingContentMemberOrIntegration)
         }));
     },
 
@@ -25,8 +31,8 @@ const authorize = {
             return next();
         } else {
             return next(new errors.NoPermissionError({
-                message: i18n.t('errors.middleware.auth.authorizationFailed'),
-                context: i18n.t('errors.middleware.auth.missingAdminUserOrIntegration')
+                message: tpl(messages.authorizationFailed),
+                context: tpl(messages.missingAdminUserOrIntegration)
             }));
         }
     }