Hi,
Office 365 only available for subscription plan, there is no perpetual license.
If you want to deploy Office on Windows Virtual Desktop, you need to use Shared Computer Activation(SCA) and this kind of activation mode only available for subscription plan.
You can refer to this support article about how to deploy with SharedComputerLicensing property in XML:
https://www.infusedinnovations.com/blog/secure-modern-workplace/guide-to-deploy-office-365-proplus-in-windows-virtual-desktop
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Hope the information is helpful.
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