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I don't understand why but there is a link to profile from comment only for the admin but not for the other profile (author, subscriber...). I'm developing on local so I can't give you a url. I unactivated all plugins and changed to regular theme, try to create other account but there is no link except for admin.
Hi @mathieufd,
you need to make sure the Website field is filled in Dashboard > Users > Edit user page.
Also, each author should have at least one post, to allow the authors to have a profile link.
Please read this support topic, it also provides useful information:
https://wordpress.org/support/topic/add-author-url-to-comment/#post-11154572
See my following post for more referring problem: https://gvectors.com/forum/how-to-and-troubleshooting/avatar-not-changing/#post-13430