My customer has SQL Server licenses that they have purchased through a Volume Licensing agreement with Software Assurance. If they wish to exercise Fail-Over Rights (that are one of SQL Server’s SA) to run the benefits.), Can I host their fail-over serve

While Software assurance provide fail-over rights for the customer’s SQL Server, the fail-over server must exist in the same environment as the active server. For example, both in DC or on-premises). Also, note that the fail-over server must be truly passive and must not be serving data to the clients.