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Open Setup → Email Template and click on the mail where you want to add the Auto Login Link.
At the WHMCS Mail Editor you can add &{$modautologin} to existing links or create a new link with &{$modautologin} at the end.

URL Examples:

{$whmcs_url}viewinvoice.php?id={$invoice_id}&{$modautologin}
https://your-whmcs.com/clientarea.php?{$modautologin}
{$ticket_link|strip_tags:false}&{$modautologin}

Auto Login From WHMCS Mails > Usage > Loginfrommail4.png

Note: Replace & with ? if there are no parameters before the Auto Login Link (like demonstrated in the examples above).

If you use a mail variable, which is already sent as a hyperlink by default, please add "|strip_tags:false" to the WHMCS mail variable. This will remove the HTML code.

Please take a look at the last example above.