please try adding this code in plugin editor>> wplms customizer.php
add_filter( 'bp_email_use_wp_mail', '__return_true' );
If you do not have wplms customizer plugin then
You can get it from here-
https://wplms.io/support/knowledge-base/wplms-customizer-plugin/
goto wp-admin -> lms – > settings -> touch points -> edit
email template -> check if there is any template there .