NIS 10 Key invalid

Hi all,

We're an IT company with thousands of laptops in the field with NIS 10. Since approximately 10 days ago, we haven't been able to activate NIS 10 on any of our machines. Nis 9 activates just fine. The error message on NIS 10 is: "Invalid product key". I know it's a valid key because it works on NIS 9, and up until approximately 10 days ago, our keys were working fine with NIS 10 as well. Thank you