diff --git a/argilla-server/src/argilla_server/contexts/accounts.py b/argilla-server/src/argilla_server/contexts/accounts.py
index 0395556e84..2e9321dad6 100644
--- a/argilla-server/src/argilla_server/contexts/accounts.py
+++ b/argilla-server/src/argilla_server/contexts/accounts.py
@@ -119,12 +119,7 @@ async def create_user(
     if await get_user_by_username(db, user_attrs["username"]) is not None:
         raise NotUniqueError(f"User username `{user_attrs['username']}` is not unique")
 
-    if user_id := user_attrs.get("id"):
-        if await User.get(db, id=user_id) is not None:
-            raise NotUniqueError(f"User with id `{user_id}` is not unique")
-
-    user = await User.create(
-        db,
+    new_user = User(
         id=user_attrs.get("id"),
         first_name=user_attrs["first_name"],
         last_name=user_attrs["last_name"],
diff --git a/argilla-server/src/argilla_server/validators/users.py b/argilla-server/src/argilla_server/validators/users.py
index 3d506fb032..47215f53dd 100644
--- a/argilla-server/src/argilla_server/validators/users.py
+++ b/argilla-server/src/argilla_server/validators/users.py
@@ -22,6 +22,7 @@ class UserCreateValidator:
     @classmethod
     async def validate(cls, db: AsyncSession, user: User) -> None:
         await cls._validate_username(db, user)
+        await cls._validate_user_id(db, user)
 
     @classmethod
     async def _validate_username(cls, db, user: User):
@@ -39,3 +40,11 @@ async def _validate_unique_username(cls, db, user):
     async def _validate_username_length(cls, user: User):
         if len(user.username) < 1:
             raise UnprocessableEntityError("Username must be at least 1 characters long")
+
+    @classmethod
+    async def _validate_user_id(cls, db, user: User):
+        if user.id is None:
+            return
+
+        if await User.get(db, id=user.id) is not None:
+            raise NotUniqueError(f"User with id `{user.id}` is not unique")