BuddyPress.org

Sorry I meant buddypress 6.2, WordPress 5.5 Not sure how I fix this post.

Thanks for your offer of help! I am not seeing php errors. As for the javascript, it pops up the box and I submit. But then the page reloads but no action occurs. I put some logging into the code (see below) It looks to me like $_REQUEST is not set and so the loop never executes at all. This returns false false false

function console_log($data){
  echo '<script>';
  echo 'console.log('. json_encode( $data ) .')';
  echo '</script>';
}

function add_users_to_bpgroup() {   
    if( bp_is_active('groups') ):
              console_log(isset( $_REQUEST['action'] ));
              console_log(isset( $_REQUEST['bp_gid'] ));
              console_log(isset( $_REQUEST['allusers'] ));
        if( isset( $_REQUEST['action'] ) && isset( $_REQUEST['bp_gid'] ) && isset( $_REQUEST['allusers'] ) ) {
            $group_id = $_REQUEST['bp_gid'];
            $users = $_REQUEST['allusers'];

            foreach ( $users as $user_id ) {
                groups_join_group( $group_id, $user_id );
            }
        }
        //form submission
        add_action( 'admin_footer', function() { ?>
            <script type="text/javascript" charset="utf-8">
                jQuery("select[name='action']").append(jQuery('<option value="groupadd">Add to BP Group</option>'));
                jQuery("#doaction").click(function(e){
                    if(jQuery("select[name='action'] :selected").val()=="groupadd") { e.preventDefault();
                        gid=prompt("Enter a Group ID","1");
                        jQuery(".wrap form").append('<input type="hidden" name="bp_gid" value="'+gid+'" />').submit();
                    }
                });
            </script>
        <?php
        });
         
    endif;
}