On https://www.mediawiki.org/wiki/Phabricator/Help#Creating_your_account the sub-chapter "Using your global wiki account", first asterisk-entry (bullited entry) reads: First, make sure you are [logged in] to Wikimedia. This link [logged in] leads to exactly the same page on which this link is located. Not a helpful link, to me. Steue (talk) 03:58, 2 May 2022 (UTC)
Topic on Project:Village Pump
That is because you are already signed into a Mediawiki Wiki, Which is apart of the Wikimedia Single User Login environment.