diff --git a/services/web/app/src/Features/Project/ProjectController.js b/services/web/app/src/Features/Project/ProjectController.js
index c62098a274..e472f8c7ed 100644
--- a/services/web/app/src/Features/Project/ProjectController.js
+++ b/services/web/app/src/Features/Project/ProjectController.js
@@ -1066,6 +1066,17 @@ const ProjectController = {
             }
           )
         },
+        accessCheckForOldCompileDomainAssigment(cb) {
+          SplitTestHandler.getAssignment(
+            req,
+            res,
+            'access-check-for-old-compile-domain',
+            () => {
+              // We'll pick up the assignment from the res.locals assignment.
+              cb()
+            }
+          )
+        },
         userContentDomainAccessCheckAssigment(cb) {
           SplitTestHandler.getAssignment(
             req,
diff --git a/services/web/app/src/Features/UserContentDomainCheck/UserContentDomainController.js b/services/web/app/src/Features/UserContentDomainCheck/UserContentDomainController.js
index bcce34a955..06cc7223c6 100644
--- a/services/web/app/src/Features/UserContentDomainCheck/UserContentDomainController.js
+++ b/services/web/app/src/Features/UserContentDomainCheck/UserContentDomainController.js
@@ -1,11 +1,14 @@
 const Metrics = require('@overleaf/metrics')
 
 function recordCheckResult(req, res) {
+  const path = req.body.isOldDomain ? 'old' : ''
   Metrics.count('user_content_domain_check', req.body.succeeded, 1, {
     status: 'success',
+    path,
   })
   Metrics.count('user_content_domain_check', req.body.failed, 1, {
     status: 'failure',
+    path,
   })
   res.sendStatus(204)
 }
diff --git a/services/web/app/src/router.js b/services/web/app/src/router.js
index 679fbcb460..fc73dd4ed6 100644
--- a/services/web/app/src/router.js
+++ b/services/web/app/src/router.js
@@ -206,7 +206,7 @@ const rateLimiters = {
   userContentDomainAccessCheckResult: new RateLimiter(
     'user-content-domain-a-c-r',
     {
-      points: 15,
+      points: 30,
       duration: 60,
     }
   ),
@@ -1348,6 +1348,7 @@ function initialize(webRouter, privateApiRouter, publicApiRouter) {
       body: Joi.object({
         failed: Joi.number().min(0).max(6),
         succeeded: Joi.number().min(0).max(6),
+        isOldDomain: Joi.boolean().default(false),
       }),
     }),
     RateLimiterMiddleware.rateLimit(
diff --git a/services/web/frontend/js/features/user-content-domain-access-check/index.ts b/services/web/frontend/js/features/user-content-domain-access-check/index.ts
index f782a96352..74e197916a 100644
--- a/services/web/frontend/js/features/user-content-domain-access-check/index.ts
+++ b/services/web/frontend/js/features/user-content-domain-access-check/index.ts
@@ -126,7 +126,9 @@ async function singleCheck(
   }
 }
 
-export async function checkUserContentDomainAccess() {
+export async function checkUserContentDomainAccess(
+  compileDomainOrigin: string
+) {
   // Note: The ids are zero prefixed. No actual user/project uses these ids.
   // mongo-id 000000000000000000000000 -> 1970-01-01T00:00:00.000Z
   // mongo-id 000000010000000000000000 -> 1970-01-01T00:00:01.000Z
@@ -141,16 +143,12 @@ export async function checkUserContentDomainAccess() {
   if (getMeta('ol-user_id')) {
     // Logged-in user
     urls.push(
-      `${getMeta(
-        'ol-compilesUserContentDomain'
-      )}/zone/${zone}/project/${projectId}/user/${userId}/build/${buildId}/output/output.pdf`
+      `${compileDomainOrigin}/zone/${zone}/project/${projectId}/user/${userId}/build/${buildId}/output/output.pdf`
     )
   } else {
     // Anonymous user
     urls.push(
-      `${getMeta(
-        'ol-compilesUserContentDomain'
-      )}/zone/${zone}/project/${projectId}/build/${buildId}/output/output.pdf`
+      `${compileDomainOrigin}/zone/${zone}/project/${projectId}/build/${buildId}/output/output.pdf`
     )
   }
 
@@ -216,7 +214,9 @@ export async function checkUserContentDomainAccess() {
         if (
           isSplitTestEnabled('report-user-content-domain-access-check-error')
         ) {
-          captureException(err)
+          captureException(err, {
+            tags: { compileDomain: new URL(compileDomainOrigin).hostname },
+          })
         } else {
           console.error(OError.getFullStack(err), OError.getFullInfo(err))
         }
@@ -227,7 +227,12 @@ export async function checkUserContentDomainAccess() {
 
   try {
     await postJSON('/record-user-content-domain-access-check-result', {
-      body: { failed, succeeded: cases.length - failed },
+      body: {
+        failed,
+        succeeded: cases.length - failed,
+        isOldDomain:
+          compileDomainOrigin === getMeta('ol-compilesUserContentDomain'),
+      },
     })
   } catch (e) {}
 
@@ -282,7 +287,12 @@ export function scheduleUserContentDomainAccessCheck() {
       recordMaxAccessChecksHit()
     }
     if (remainingChecks-- <= 0) return
-    checkUserContentDomainAccess()
+    if (isSplitTestEnabled('access-check-for-old-compile-domain')) {
+      checkUserContentDomainAccess(getMeta('ol-fallbackCompileDomain')).catch(
+        () => {}
+      )
+    }
+    checkUserContentDomainAccess(getMeta('ol-compilesUserContentDomain'))
       .then(ok => {
         accessCheckPassed = ok
       })