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The Service Account (Run As) does not automatically have permissions to login to Tableau Server. It is simply the Domain Account that Tableau runs under. For example, if you set "Run As" as mydomain\me, that doesn't mean you'll be able to login to Tableau Server itself via mydomain\me. You can only login with AD accounts which have been specifically granted this right.
Are you able to login with any AD account? Perhaps you meant to say "Admin Account" ? If you specifically added mydomain\me as an Admin during setup of your backed up server, or you added mydomain\me as a user afterwards, you should be able to login with that user.