I think it’s a problem with your licence. Maybe your licence only supports one phone at a time. Contact TEMS support, they should be able to sort it out for you.
However, if you have an older version of tems, you can use one phone of eg TEMS 8.0 and one phone of TEMS 9.0, each with its HASP. That will surely work. Otherwise, the only option will be to contact support.