it is not possible to map multiple songs at once anymore.
if you click on the link thingy next too an album on the link listen page, nothing happens. (there should be a popup where you can enter the release-group mbid to link all songs at once)
if you do it for an individual song it does work.
i think this is since the link listen page is added to the explore page.
(which also feels a bit weird since it is just a redirection to your settings page, i don’t expect to be redirected to my settings when i am on an explore page, if it was a separated page (with no settings menu) then it would feel more logical)