Just to inform you: the newest release of the SURFconext IdP dashboard (10.0.11) and Manage have a new option where, depending on the value of a new key in Manage, coin:dashboard_connect_option, upon a connection request from an IdP, the SP is
a) not connected but the federation support team is mailed about the connection request,
b) connected and the SP admin contact is informed by email about the new connection or
c) connected and the SP is not informed.
So for SP's that are o.k. with automatic connection, this expedites the connection process.