This username has been blocked across all Wikipedias. If I understand correctly, this is because it is too close to a previously existing username and appears to be impersonating that user.

There would be a further reason for blocking this username: it appears to have been set up to promote a single point of view on a single topic, and the only substantive edit it has made on Vicipaedia confirms that impression, since it was used only to add several external links to one page. Andrew Dalby (disputatio) 11:51, 2 Iunii 2023 (UTC)