@Subhash Arya,
1. Try to reset/delete the Lumerical preference/configuration.ini files including the "License.ini" from your computer.
Ansys Lumerical product preference files – Ansys Optics
2. Then configure Lumerical to obtain the license from the Ansys LM on Server: localhost, Default Port.
How to obtain a floating license – Ansys Optics
3. Ensure that the Domain in the Lumerical Licenses configuration is "Standard"
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