we can use normal windows username and password in configuration. dont use other username and passwords.
From the error message in the screenshot it appears that either the tabsvc.yml, workgroup.yml or both have been altered. Please open a Technical Support case by emailing firstname.lastname@example.org and make sure to include Tableau Server log files using the steps in the Knowledge Base article below:
Creating Tableau Server Log Files
were you editting tabsvc.yml directly? It should be avoided as it seems you have an invalid value for the vizql session timeout. You can set this timeout via the command line by pathing to: installdirectoryforTableau\releasenumber\bin and then doing a tabadmin set vizqlserver.session.expiry.timeout 60 and then doing a tabadmin config and then doing a tabadmin restart. It's usually a safer option.