To let the connector work properly you should define an application name in config/addon.config.php:
'pumpio' => [
'application_name' => '',
// Displays forwarded posts like "wall-to-wall" posts.
'wall-to-wall_share' => false,
// Given in minutes
'poll_interval' => 5,
],
This name appears at pump.io and is important for not mirroring back posts that came from Friendica.