BuddyPress.org

This post explains everything:
https://buddypress.org/community/groups/how-to-and-troubleshooting/forum/topic/activating-existing-users/#post-40221

You’ll need to write a script that gives everyone a “last_activity” timestamp.

Some example code to get it working for one user:
`
// change $user_id to the ID you want to become active
update_user_meta( $user_id, ‘last_activity’, bp_core_current_time() );`

@r-a-y: Thanks for the help with this! I haven’t found a plugin which searches through inactive members and creates an activity for them. One thing to note about the above code is that the user will show up as most recent active user in widgets such as the Members widget and in the Members directory so you might want to change the date to a few days/weeks back to prevent that.