After going through the install process, you receive the following error when attempting to access the web URL for the first time:
Access Denied – Reason: You have not been granted access to this site.
The web application is being accessed by an account that was not setup as a default administrator. During the database portion of the install, the current user’s credentials are configured for site access as the default administrator (SFSA role). Only that user and an optional secondary admin have access to the web application initially.
Access the web URL with the same account that was used to perform the database install. Once logged in, go to Settings > Users and add accounts that should have access, placing them in the correct roles for your organization.
If the database install was performed by a database administrator who will not be an ongoing site administrator, remove that account from the SFSA role.