Ipad app Server sync issues

WE have an issue where the own cloud app will not allow iPads to sync to our own cloud server

it works fine on all of our laptops etc it is just iPads

the users get server is unavailable please try later

yet it appears to work if you use the browser

own cloud server is version 8.1.3

iPads are all on the latest iOS

and latest own cloud app

version 8.1.3

from the issue template shown when creating a new thread:

make sure that you're running the latest available version for your oC release: https://owncloud.org/changelog/

Please create a new thread after you have followed the advice and make sure that you're filling out the shown issue template. Without that two things its not possible to help here.

It might be also just a duplicate of: