I think the default team site was accidentally deleted from SharePoint Online. Now the message "404 file not found" appears when I click on the SharePoint link on the Office 365 home page.
The bad URL is https: //domain.sharepoint.com / _layouts / 15 / sharepoint.aspx
I do not see the deleted page on the SharePoint Administration Website-> Sites-> Deleted Sites, so I can not restore it from there.
I am very new to SharePoint, every help is appreciated.