Outlook mobile ask to apply the pasword each logon active sync

We are satisfied with the Kopano web-app, but each time we open the outlook client on a mobile device, it ask for the user credentials.
Same issue happens, on a iPhone, or Android client.
This happens already for a couple months, but can’t find the solution.
Hopefully one off you can tell me how we can solve this issue!

Best never ever use outlook app on android or ios - this app is a Men in the Middle App - your client will never auth to your kopano server directly - it connects to a microsoft server which then auths to your kopano server - so all passwords are stored at microsoft too.

i can not agree with this article where Microsoft has removed this - as i have still customers using this app and they all access the server through ms servers (you can see the ip of the connection on z-push)


Crosspost: https://forum.kopano.io/topic/3432/outlook-mobile-ask-each-logon-for-password