When using OATHAuth with a central DB, it means the account name is going to use the local Sitename... Which is fine if all sites were the same... But we have MediaWiki, Wikipedia... etc
public function getAccount() { global $wgSitename; return "$wgSitename:{$this->user->getName()}"; }
We should force it to something like Wikimedia, possibly in English? As otherwise it could become confusing that the account for Wikipedia 2FA works on MediaWiki
Helps fix like T138423 for WMF wikis too... But that bug is still there for other non WMF wikis