I thought this problem was solved, but somehow it’s creeped up again. I tried to edit a user profile, to change their e-mail address (ex.: user@gmail.com) and the form is identifying it as an invalid address.
I can’t seem to find where is the validation in order to check what’s happening.
(Un)Fortunately, something happened and now we managed to edit the user profile. Since we copy-pasted the email address received, maybe a strange character was brought in the first time.