Has OneCalendar been abandoned by the owners/developers? I do not see any communication from them for several years

When I add an event to the calendar on my Android phone under a specific email account, it doesn't sync to my laptop app. The account I use to add the event is on my laptop version. Why isn't it syncing?

Druckeinstellungen fehlen. 

I love this app and have purchased the license. I now have added my MS365 account and I can see all my private calendars. I am part of a Team (MS Teams) that has its own calendar.

In Outlook I can see this calendar (as a "group calendar") but there seems to be no trace in OneCalendar.

I'm posting a picture of how I see this calendar in Outlook.

Is there a way to add it. The point of this app is to have ALL your calendars in one place and this seems to be creating an exception.

Thanks in

Where does OneCalendar get its available contacts for sharing an appointment using the People tab?

I have a contact in a number of my different accounts linked to OneCalendar that does not get shown for being able to select in the list offered.