I use a subscription and unsubscription page with the short code mentioned in the subject.
When you indicate your email and validate the captcha and the form, the system indicates that it has sent an email with a link. But in fact there is no mail that is sent.
You should be able to test on the link page.
Thanks in advance for your help.
Bug confirmed (the case was when a person in EME was part of a group but did also have a name/firstname in EME, then the search didn’t match because I first search for empty name and only matching email)
This fixes it: https://plugins.trac.wordpress.org/changeset/2524289/