New Post: Error in granting rights to Profile and Social database (User Profile Service Application)

I get this same error on the Social and Profile databases wherein the application pool account SP_PortalAppPool could not be added to the shell admin role on those databases. I'm using:

-v 3.96 of the script
-Windows 2012
-SQL 2012
-SharePoint Enterprise 2013
-Individual accounts for

SP_Admin
SP_Farm
SP_Services
SP_PortalAppPool
SP_ProfilesAppPool
SP_SearchService
SP_CacheSuperUser
SP_CacheSuperReader
SP_ProfileSync
SP_SearchContent

Error messages are:

• Granting CORP\SP_PortalAppPool rights to SP2013_Profile...
  Add-SPShellAdmin :
  "Cannot add CORP\SP_PortalAppPool to the SharePoint_Shell_Access role of the database SP2013_Profile. A possible
  cause of this error is that the account name was already added to the database as a login using a different user name
  than the account name."
  At \192.168.1.100\f$\Software\SharePoint\SP2013\AutoSPInstaller\SP\AutoSPInstaller\AutoSPInstallerFunctions.ps1:2996
  char:67
• Get-SPDatabase | ? {$_.Name -eq $profileDB} | Add-SPShellAdm ...
• ~~~~~~~~~~~~~~
  
  • CategoryInfo : InvalidData: (Microsoft.Share...AddSPShellAdmin:SPCmdletAddSPShellAdmin) [Add-SPShellAdm
    in], ArgumentException
  • FullyQualifiedErrorId : Microsoft.SharePoint.PowerShell.SPCmdletAddSPShellAdmin
    
• Granting CORP\SP_PortalAppPool rights to SP2013_Social...
  Add-SPShellAdmin :
  "Cannot add CORP\SP_PortalAppPool to the SharePoint_Shell_Access role of the database SP2013_Social. A possible
  cause of this error is that the account name was already added to the database as a login using a different user name
  than the account name."
  At \192.168.1.100\f$\Software\SharePoint\SP2013\AutoSPInstaller\SP\AutoSPInstaller\AutoSPInstallerFunctions.ps1:2998
  char:66
  
• Get-SPDatabase | ? {$_.Name -eq $socialDB} | Add-SPShellAdmi ...
• ~~~~~~~~~~~~~~~
  
  • CategoryInfo : InvalidData: (Microsoft.Share...AddSPShellAdmin:SPCmdletAddSPShellAdmin) [Add-SPShellAdm
    in], ArgumentException
  • FullyQualifiedErrorId : Microsoft.SharePoint.PowerShell.SPCmdletAddSPShellAdmin