EM was installed on a WP MU site; with setting "Link sub-site events directly to sub-site?" = false.
An event was created on a subsite, a test-booking was made for a new visitor (on the main site).
The mail with the credentials contained this text as the last sentence:
"To view your bookings, please visit attending/ after logging in."
After some changes and tests with the above-mentioned setting at true & false; and having a look at the EM settings,
mails with credentials now contain a valid link in the last sentence, like this one:
To view your bookings, please visit http://attentie.com/evenementen-2/my-bookings/ after logging in.
('evenementen' is my events-page)