Atollon Calendar in Android If you want to use Atollon CalDAV calendar API, please make sure you recently changed your Atollon's user password. Below you can find a guide on how to set-up your access to Atollon calendar using One Caledar application for Android 10. From GooglePlay app store install One Caledar Open OneCaledar application and slect preffered theme Select account type CalDAV Fill-in Atollon CalDAV account details and push Connect button Check found Atollon caledar and push Done button Done Optionally save account credentials and push menu symbol To refresh calendar data push Sync Got new event from Atollon CalDAV Click New event to show detail Click New event to edit event Click somewhere in the calendar to Add event See event in Atollon Calendar, after view change Aplication details One Callendar FAQ