Sign-in & authentication issuesTroubleshoot issues related to sign-in and authentication in B2CORECopy MarkdownOpenPDFClients encounter the 404 Not Found error after signing in to the B2CORE UIClients experience sign-in issues on the B2CORE mobile appLast updated on PreviousWelcome to TroubleshootingNextClients encounter the 404 Not Found error after signing in to the B2CORE UI