Integrated LDAP User blocking when using mobile app


I have NC integrated with my AD. When users install the mobile app on their cells the user blocks very often, and it’s due to “something” the app is doing; I haven’t this problem with users not using the mobile app.

It happens with IOS and Android app.

Does anyone faced the same issue?

Nextcloud version: 13.0.0
Operating system and version: Ubuntu 16.04
Apache or nginx version: Apache 2.4.18
PHP version: 7.0.30