Oftentimes, users of your site report an issue that they aren’t able to receive any BuddyBoss or WordPress email such as activation email, notification email when a member sends a private message, etc.
What we may suggest is to try installing the below plugin to resolve the all-too-common problem of emails from WordPress sites going missing or ending up in spam folders. I tested the registration process on my dev site using the latest version of the BuddyBoss Platform and Theme and it is working as expected.
WP Mail SMTP: