Can't sync Nextcloud Calendar with DAVx5 (Android)


I have two questions about Nextcloud Calendar:

1.- I synced an external calendar with my Nextcloud calendar and I can see all events. The matter is when I try to sync this new calendar with my phone: Pasting ‘Copy private link’ from the new Nextcloud calendar on DAVx5, the new connection from my phone is to original calendar, not to Dirsroot (the link I have is…). How can I fix it?

2.- When a new events is created in this calendar, is sent an email as notification? I have this option checked in ‘Activity Notifications’, but when I sync the calendar I didn’t receive any email.

Thanks a lot and sorry for my English.