Add a note warning about issue 276930

doc/user/project/settings/import_export.md

@@ -203,6 +203,9 @@ NOTE:
 The maximum import file size can be set by the Administrator, default is `0` (unlimited).
 As an administrator, you can modify the maximum import file size. To do so, use the `max_import_size` option in the [Application settings API](../../../api/settings.md#change-application-settings) or the [Admin Area UI](../../admin_area/settings/account_and_limit_settings.md). Default [modified](https://gitlab.com/gitlab-org/gitlab/-/issues/251106) from 50MB to 0 in GitLab 13.8.
 
+NOTE:
+There is currently an [issue](https://gitlab.com/gitlab-org/gitlab/-/issues/276930) where project fails to import if [shared runners enablement](https://docs.gitlab.com/ee/ci/runners/runners_scope.html#enable-shared-runners) does not match between project exported and project import. Ensure either both project have share runners enabled, or disable when importing project.
+
 ### Project import status
 
 You can query an import through the [Project import/export API](../../../api/project_import_export.md#import-status).