Two factor auth have been pushed to every wikis, with tables at CentralAuth level for public Wikimedia projects, but private and fishbowl wikis must have their own.
It occurred today projectcomwiki didn't have the oathauth_users table (T143138). New private wikis will have it in the future per 8b6813d5.
But for former wikis, the table existence should be checked for the following databases:
fishbowl.dblist + private.dblist
cnwikimedia donatewiki foundationwiki nostalgiawiki rswikimedia votewiki arbcom_cswiki arbcom_dewiki arbcom_enwiki arbcom_fiwiki arbcom_nlwiki auditcomwiki boardgovcomwiki boardwiki chairwiki chapcomwiki checkuserwiki collabwiki ecwikimedia execwiki fdcwiki grantswiki iegcomwiki ilwikimedia internalwiki legalteamwiki movementroleswiki noboard_chapterswikimedia officewiki ombudsmenwiki otrs_wikiwiki projectcomwiki searchcomwiki spcomwiki stewardwiki transitionteamwiki wg_enwiki wikimaniateamwiki zerowiki