Build custom email template for Wordpress

I need to customise emails templates for my client's Wordpress website. He wants to receive an email when a user creates an account in the website so that he can easily approve this account (or deny). He wants the email to have the user's email and 3 buttons: "approve" "deny" and "more info". I am trying to do this using the UltimateMember plugin. I was able to activate the custom email and to have some fields working, such as the user email and custom text. But I am not having success in using Placeholders to add the "approve" "deny" and "more info" functions. Please see below the link to the Plugin's list of functions Placeholders: [login to view URL] I am trying to use the {account_activation_link} Placeholer to add the "approve" function, but the account activation link does not appear when the email is sent. Please see below the the text that I receive in the email, note that after the account activation there is no link: __________________________________________________________ xxxx@[login to view URL] has just created an account on the website. To view their profile click here: [login to view URL] Account activation: Here is the submitted registration form: Thank you! __________________________________________________________ The code for this email template: <div style="max-width: 560px; padding: 20px; background: #ffffff; border-radius: 5px; margin: 40px auto; font-family: Open Sans,Helvetica,Arial; font-size: 15px; color: #666;"> <div style="color: #444444; font-weight: normal;"> <div style="text-align: center; font-weight: 600; font-size: 26px; padding: 10px 0; border-bottom: solid 3px #eeeeee;">{site_name}</div> <div style="clear: both;"> </div> </div> <div style="padding: 0 30px 30px 30px; border-bottom: 3px solid #eeeeee;"> <div style="padding: 30px 0; font-size: 24px; text-align: center; line-height: 40px;">{display_name} has just created an account on {site_name}.</div> <div style="padding: 10px 0 50px 0; text-align: center;">To view their profile click here: <a style="color: #3ba1da; text-decoration: none;" href="{user_profile_link}">{user_profile_link}</a><br />Account activation: <a style="color: #3ba1da; text-decoration: none;" href="{account_activation_link}">{account_activation_link}</a></div> <div style="padding: 0 0 15px 0;"> <div> </div> <div style="background: #eee; color: #444; padding: 12px 15px; border-radius: 3px; font-weight: bold; font-size: 16px;">Here is the submitted registration form:<br /><br />{submitted_registration}</div> </div> </div> <div style="color: #999; padding: 20px 30px;"> <div>Thank you!</div> <div>The <a style="color: #3ba1da; text-decoration: none;" href="{site_url}">{site_name}</a> Team</div> </div> </div> <p><!--more--></p> <p><!--more--></p> ________________________________________ The website: [login to view URL] The freelancer that gets this job will get also to do one more email template that needs to be done after this one.