Troubleshoot Run As User
As discussed in the topic, Run As User, Tableau Server requires administrative-like access to the machine on which it is installed. Therefore, when you update the Run As User in Tableau Server Configuration, a background process will configure permissions on the Tableau computer for that account. However, in some complex deployment scenarios you may need to verify or manually configuration the Run As User permissions on the local Tableau Server computer. Use this section to verify how permissions are configured on the machines running Tableau Server in your deployment. This section also includes procedures that describe how to set permissions and configure security policies for the Run As User.