diff --git a/news/4292.internal b/news/4292.internal
new file mode 100644
index 000000000..9743ba52b
--- /dev/null
+++ b/news/4292.internal
@@ -0,0 +1 @@
+Use standalone ``generate_user_id`` / ``generate_login_name`` functions from ``plone.app.users.utils`` instead of instantiating the registration form view. @jensens 
diff --git a/src/plone/restapi/services/users/add.py b/src/plone/restapi/services/users/add.py
index 90a4bf19d..052d0f099 100644
--- a/src/plone/restapi/services/users/add.py
+++ b/src/plone/restapi/services/users/add.py
@@ -1,5 +1,14 @@
 from AccessControl import getSecurityManager
 from plone.app.users.schema import ICombinedRegisterSchema
+
+try:
+    from plone.app.users.utils import generate_login_name
+    from plone.app.users.utils import generate_user_id
+
+    HAS_STANDALONE_GENERATORS = True
+except ImportError:
+    # BBB: plone.app.users without standalone generators (Plone < 6.2)
+    HAS_STANDALONE_GENERATORS = False
 from plone.restapi import _
 from plone.restapi.bbb import ISecuritySchema
 from plone.restapi.deserializer import json_body
@@ -234,13 +243,19 @@ def _add_user(self, data, location=True):
             "fullname": data.get("fullname", ""),
         }
 
-        register_view = getMultiAdapter((self.context, self.request), name="register")
-
-        register_view.generate_user_id(user_id_login_name_data)
-        register_view.generate_login_name(user_id_login_name_data)
+        if HAS_STANDALONE_GENERATORS:
+            user_id = generate_user_id(self.context, user_id_login_name_data)
+            login_name = generate_login_name(self.context, user_id_login_name_data)
+        else:
+            # BBB: plone.app.users without standalone generators (Plone < 6.2)
+            register_view = getMultiAdapter(
+                (self.context, self.request), name="register"
+            )
+            user_id = register_view.generate_user_id(user_id_login_name_data)
+            login_name = register_view.generate_login_name(user_id_login_name_data)
 
-        user_id = user_id_login_name_data.get("user_id", data.get("username"))
-        login_name = user_id_login_name_data.get("login_name", data.get("username"))
+        user_id = user_id or username or email
+        login_name = login_name or username or email
 
         username = user_id
         properties["username"] = user_id