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I don’t know why, but I have found a solution. As ‘check_slug’ worked, I just took the code from that function, amended it to return the group id instead of the slug, and included it in my function – which worked. Be good to understand why none of the other functions worked though?

function ofc_add_registrant_to_group($registration, $old_STS_ID, $new_STS_ID, $context) {
  
   global $wpdb;
 
   $user_id = get_current_user_id();

   if (! $registration instanceof EE_Registration ) {
        // No EE_Registration, get out
        return;
    }
   
    $event_id = $registration->event_ID();
    $subgroups = get_field('event_sub_group', $event_id);

    $slug = $subgroups[0]->post_name;

    // These two lines made the difference
    $bp = buddypress();
    $group_id = $wpdb->get_var( $wpdb->prepare( "SELECT id FROM {$bp->groups->table_name} WHERE slug = %s", $slug ) ); 

    if ( ! groups_is_user_member($user_id, $group_id )) {
       groups_join_group($group_id, $user_id);
    }
}
add_action('AHEE__EE_Registration__set_status__to_approved', 'ofc_add_registrant_to_group', 10, 4); 

Sure no problem. So here is my scenario.

There are 2 member types and I have a custom user field created, let’s called it Items.

Both member types need to select some of those Item checkboxes. Now I need to show the oposite member types with common Items on a member profile. For that I created a custom page and run the Members loop. I was able to show the oposite members. But I am not sure how to match the Items and filter those oposite members. The my_custom_id() function works well if it is a textbox field. But it doesn’t work with the checkboxes. You can see how they are stored in the database.

I can get the current logged in user’s Items list in an array format. I think if I follow the my_custom_id() function then I will have to pass the field name and the array to compare like this my_custom_id($item_field, $current_user_items_array)

I think with that the SQL select query in the function needs to be modified.

Hope this clarifies my requirement.

I am very new to buddypress. If there is another way to achieve this then I will be happy to implement. My main goal is to show the members with common items selected but from the opposite member type to a logged in member.

Thank you so much.

Sorry, I did not notate that well in the post above, should have been buddypress/members/single/front-member-type-{type}.php.

Also, it appears that in the multisite mode, when accessing <subdomain>/members/<user> it does not pick up my child theme’s buddypress/members/single/front-member-type-type.php file. I have manually set the sub-site bp option to use the nouveau template, and the active theme is the correct child theme.

Thanks,