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That works to an extent but it filters everything on the page and what I need is essentially two user’s activity streams on the same page. Any advice on how to make that work? It sounds like someone was trying to do something very similar in this post but it was years ago

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I actually didn’t know about that, I’m fairly new to WordPress. I’ll certainly update that and the companion queries that go with it once I can get this function sorted out.

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My mistake on the first post, I had some things mixed up. Here is the full action & function.

 // Get partner ID
 function sw_partner_activity() {
	 do_action('sw_partner_activity');
 }
 
 
function sw_partner_id() {
	
	global $bp, $wpdb;
	$myid = $bp->loggedin_user->id;
	$ourlink = $wpdb->get_var("SELECT meta_value FROM $wpdb->usermeta WHERE meta_key = 'linkid' AND user_id = '$myid'");
	$partnerid = $wpdb->get_var("SELECT user_id from $wpdb->usermeta where meta_key='linkid' AND meta_value = '$ourlink' AND user_id != '$myid'");
	$partner =  '&user_id=' . $partnerid;
	
	return $partner;
	
}
add_action('sw_partner_activity', 'sw_partner_id'); 

And the proper call:
<?php sw_partner_activity();?>

And the error (with echo of query results):

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No, it’s a custom hook. I’ve tried using existing hooks as well. If I change the return to echo $partner it’s showing the result of the query, it just wont pass the variable to the activity loop here

if ( bp_has_activities( bp_ajax_querystring( 'activity' ) . $partner ) ) :

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I realize the following is completely wrong but it does show what I am trying to do.

$not_private = $wpdb->get_var("UPDATE wp_bp_friends SET private = '".$is_private."' WHERE private != '".$is_private."'");