Same isse. WP does not want to activate it.
You’ve got to amend the header of your buddypress-cover-photo.php file from
<?php
/**
* Plugin Name: BuddyPress Cover Photo
* Version: 1.1.1
* Author: SeventhQueen
* Author URI: https://seventhqueen.com
* Plugin URI: https://seventhqueen.com
* Inspired by Brajesh Singh - https://github.com/sbrajesh/bp-custom-background-for-user-profile
* License: GPL
*
* Description: Allows Users to upload Cover photo to their profiles and to Groups
*/
to
<?php
/*
Plugin Name: BuddyPress Cover Photo
Version: 1.1.1
Author: SeventhQueen
Author URI: https://seventhqueen.com
Plugin URI: https://seventhqueen.com
Inspired by Brajesh Singh - https://github.com/sbrajesh/bp-custom-background-for-user-profile
License: GPL
Description: Allows Users to upload Cover photo to their profiles and to Groups
*/