public beta build 7339 / userlist - overview with Last Login information

many of our accounts are showing today Feb 6th 2020 and (WebMail),
but normally our users are using eMClient (EWS) and EAS with their mobile phones,
It is very unlikely/unnormal, that most of our users are logging in at Webmail!

Is there anything wrong/incorrect? For example the last used protocol (Webmail) or even date?
Where can I check this? administrative-logfile shows for today only admin and my own account with WEBMAIL login.

Anybody else who can check/verify "Last Login" at their SmarterMail-systems?
Many thanks in advance.

Thomas