diff --git a/src/services/identity/UsersService.ts b/src/services/identity/UsersService.ts
index 66e19a34d..8b54d76d3 100644
--- a/src/services/identity/UsersService.ts
+++ b/src/services/identity/UsersService.ts
@@ -162,7 +162,10 @@ class UsersService {
       })
       user.lastLoggedIn = new Date()
 
-      if (parsedEmail.endsWith("@cure53.de")) {
+      if (
+        parsedEmail.endsWith("@cure53.de") ||
+        parsedEmail.endsWith("@volt.cure53.de")
+      ) {
         user.contactNumber = "12345678"
       }