error/local hub/freshmoodleregistrationerror2

You are trying to register a site with a url that was previously used by another registered site. A request to register this url has already been sent to the site administrator of this other site. This administrator (probably you) need to confirm the new registration.

Also see

• https://docs.moodle.org/2x/pl/error/local_hub/freshmoodleregistrationerror