Error "Unable to add application pool account to the Nintex Workflow database" installing Nintex Workflow

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When installing Nintex Workflow, the following error occurs during the "Web Application activation" step:

Unable to add application pool account to the Nintex Workflow database

Change the dbo to another account.
In SQL management studio, run the following in both the Nintex Content Database and Nintex Config Database: sp_changedbowner 'sa'
Add the account to the WSS_Content_Application_Pools role.

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