First, I would varify that you have the ANSYS 2023 R1 or higher verssion of the License Manager installed on your license server.
Second, verify that your license supports version 2023 R1 or higher.
Lastly, check that firewall exceptions are added on the License Server for:
lmgrd
ansyslmd
ansysli_server
Firewall Youtube video:
ANSYSÂ License Manager: Configuring Firewall Exceptions on Windows (youtube.com)
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