https://help.tableau.com/current/server/en-gb/runas_change.htm
Revoke Run As Service Account Permissions - Tableau
Changing the Run As service account in Tableau Server Configuration Utility does not remove the permissions from the previous account
run as serviceaccount permissionsrevoketableau
https://help.tableau.com/current/server/en-us/runas_acct.htm
Change the Run As Service Account - Tableau
Depending on your environment and data access requirements, you may want or need to change the Run As service account
run as servicechangeaccounttableau
https://help.tableau.com/current/server/en-gb/runas_access.htm
Data Access with the Run As Service Account - Tableau
When Windows Authentication is configured, the Run As service account requires read and query permissions to the databases that are accessed by Tableau Server
run as servicedata accessaccounttableau