feat(groups): unique names

backend/src/ee/services/scim/scim-service.ts

@@ -790,6 +790,18 @@ export const scimServiceFactory = ({
       });
 
     const newGroup = await groupDAL.transaction(async (tx) => {
+      const conflictingGroup = await groupDAL.findOne({
+        name: displayName,
+        orgId
+      });
+
+      if (conflictingGroup) {
+        throw new ScimRequestError({
+          detail: `Group with name '${displayName}' already exists in the organization`,
+          status: 409
+        });
+      }
+
       const group = await groupDAL.create(
         {
           name: displayName,