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It’s possible that bp_init is fired too early in the process for it to be detected with functions.php, which is only loaded with your theme (relatively late). Try hooking to something like ‘wp’ instead. You should be able to detect whether BP is activated by doing something like
`if ( !function_exists( ‘bp_loaded’ ) )
return;`

In any case, you should be enqueuing scripts on the init action, which is unrelated to bp_init: https://codex.wordpress.org/Function_Reference/wp_enqueue_script