I just finished setting up a fresh instance of Nextcloud 28.0.3 (Ubuntu 22.04LTS, Apache2, MariaDB, PHP8.1).
I used the NC community Archive
I haven’t yet added any devices or the NC client but when I checked the Contacts app I noticed that it contains three strange and unknown emails.
I am also unable to delete them (not given an option to delete).
If I try to delete the Address book which contains them I am denied:
Deletion of address book was not successful.
10fgqub4n01bj0f153epcjhlkc@group.calendar.google.com
2oovdfjb8neb7ka5262l4dpqfo@group.calendar.google.com
lat9h4vhl5p87ibpvg9ga8h66c@group.calendar.google.com