Thank you for your reply. The license key is from Ansys. I had downloaded the application (Rocky 4.5) before on my computer from ESSS and installed that with the new license from Ansys.
I contacted our support team for Ansys in our department today, and they said that I have given the MAC which our Ansys enterprise license on it, and I must have probably given them the local MAC of my computer to add the new license. For the Rocky license, I gave them the second MAC ( Ethernet adapter Ethernet: Connection-specific DNS Suffix . : umd.edu