Log in imposible after a click on a mailchimp link


I sent an email to my users with mailchimp, in which there was a link to redirect them to their acount. I thought they would be logged in since their last connexion.
I turns out it was a big mistake, because they were redirected to an empty acount page, and now it is imposible for them to log in : they are systematically redirected to this empty acount, as if they were not in the Bubble database…

Does anyone knows what happened, and how i can fix it please ?
Thank you very much for your help.