Hi Mohamed,
here is the code that we use(similar to this)

function buddydev_update_activity_args_on_publish( $args ) {

	if ( $args['component'] !== 'blogs' || $args['type'] !== 'new_blog_post' ) {
		// change type to yours.
		return $args;
	}
	// It must be post publish. let us check for the post meta.
	// check if this was saved via BCG.
	$post_id  = $args['secondary_item_id'];
	$group_id = get_post_meta( $post_id, '_bcg_group_id', true );

	if ( ! $group_id ) {
		return;
	}

	$args['component'] = 'groups';
	$args['item_id']   = absint( $group_id );

	return $args;
}

add_action( 'bp_after_activity_add_parse_args', 'buddydev_update_activity_args_on_publish' );

You can change this

$args['type'] !== 'new_blog_post'

and replace ‘new_blog_post’ with your activity type.

And it will work. You can put the above code in your bp-custom.php

Regards
Brajesh

Thank you. I am glad it worked.
Marking as resolved.

Regards
Brajesh