クエリを実行します。
UPDATE [データベース名].[dbo].[BPASysConfig] SET [authenticationserverurl] = NULL, [enableauthenticationserverauth] = '0' where [authenticationserverurl] = 'Authentication ServerのURL'
例）
UPDATE [BluePrism].[dbo].[BPASysConfig] SET [authenticationserverurl] = NULL, [enableauthenticationserverauth] = '0' where [authenticationserverurl] = '[<https://authentication.local>](<https://authentication.local/>)'
You need to reset the sign in by using following query, it is not mentioned anyway in BP docs but there is a way-
UPDATE [DB_NAME].[dbo].[BPASysConfig] SET [authenticationserverurl] = NULL, [enableauthenticationserverauth] = '0' where [authenticationserverurl] = 'YOUR_URL_WITH_HTTPS'
https://community.blueprism.com/discussion/is-it-possible-to-change-bp-authentication-type-to-native-from-auth-server-without-having-access-to-blue-prism