When I click on ‘Forward to Friend’ link on emails template, it redirected me to the below 404 error page.
The ‘Forward to Friend’ link will work only on an email and not on an email template. To test this functionality, you need to create an email using the template which contains "Forward to Friend’ link and then send the email to your test lead. Open the email and click on the "Forward to Friend" link. Once clicked the email will open on a webpage and then the below "Forward to Friend" box will be visible.
To know more about "Forward to Friend", refer the below document.
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